The major phases of ferrous slag contain calcium-rich olivine-group silicates and melilite-group silicates. [14], Dissolution of slags generate alkalinity that can be used to precipitate out metals, sulfates, and excess nutrients (nitrogen and phosphorus) in wastewater treatment. Slag glass is a type of pressed glass that is known for its brilliant and vibrant colors. Metal furnace slag can range from glassy to dull and stony in appearance and, when scratched, can range from hard to chalky. Ferrous slag is currently underutilized. An official website of the United States government. [5], Slags can serve other purposes, such as assisting in the temperature control of the smelting, and minimizing any re-oxidation of the final liquid metal product before the molten metal is removed from the furnace and used to make solid metal. Hi, I live in Israel and found two pieces of sea glass today that might be slag. Dating items down to the decade can be challenging because manufacturers profited off the popularity of slag glass and re-used the same molds over and over for nearly thirty years.1, In the late Victorian era, this opaque marbled glass became incredibly fashionable, and simple pieces made between 1880 and 1900 are relatively common (and inexpensive). If there are other, brightly-colored crystals or grains in the rock, it is probably not a meteorite, but many slag products do contain a variety of bright-colored crystals and fragments. It is hard to keep fragile glass intact for decades. One of the most common alternate names for slag glass is marble glass, for obvious reasons. [22], Slags are transported along with slag tailings to "slag dumps," where they are exposed to weathering, with the possibility of leaching of toxic elements and hyperalkaline runoffs into the soil and water, endangering the local ecological communities. Since it is only partially mixed to create marbling, slag glass will have different tones of whiteness throughout the piece. There is another theory that slagware, and some other glass decorated with multi-colored enamels, were made up from odds-and-ends of glass left over at the end of the day, Webber reiterates.3, The most common base colors include white, cream, primrose, and blue. SOLD FEB 10, 2023. Historically, the re-smelting of iron ore slag was common practice, as improved smelting techniques permitted greater iron yields in some cases exceeding that which was originally achieved. Slag (middle photo) is much lighter per unit volume than iron meteorites, and is frequently multicolored (blue, red and purple iridescence). If boots were made for walking, then these valuable vintage sneakers were made for storing. Slag glass gets its name from slag. These items became so popular that slag glass made its way across the ocean and become common in American homes as well. When iron ore is smelted in that process, the remaining residue is a glass-like, often glossy material that takes on different colors depending on the minerals and elements present in the iron. Remember, the most common way to make slag glass was by skimming silicate material from the top of molten iron. These easily sell for thousands when in excellent condition, with Tiffany being the top of the line, of course. This being the glass version rather than stone, it makes sense to call it how you see it. Mosiac glass is sometimes used interchangeably with slag glass, although there are some technical differences. Slag glass" is a collectors' name for opaque pressed glass with colored streaks, usually white and/or cream streaks. Fenton Art Glass Identification and Value Guide. It should not have white streaks mixed into the color, nor should it be one solid color. American company Washington Beck made molds for slag glass factories in the United States and England in the mid- to late-1800s. Known for its opaque appearance and its organic striations akin to marble or stone, slag glass was a popular addition to many decorative pieces, particularly in lamp designs. A 2022 study in Finland found that road surfaces containing ferrochrome slag release a highly abrasive dust that has caused car parts to wear at significantly greater than normal rates. Learning how to identify and value this glass can help if you are looking to collect or just learn more about this interesting glassware. Slag is a by-product of smelting (pyrometallurgical) ores and used metals. During smelting, when the ore is exposed to high temperatures, these impurities are separated from the molten metal and can be removed. While collectible, the price range varies greatly depending on the item and manufacturer. The mark will usually be somewhere inconspicuous and be printed fairly small. Theres a fairly large price range for slag glass, with intricate vintage lampshades fetching the highest price. Akro Agate is an American company that marked most of their wares ranging from children's dishes to small decorative flower pots. Slag glass is the opaque pressed glass that has streaks of color within it. Sowerby, a popular pressed glass manufacturer in the UK during this time frame, was the first manufacturer to start producing slag glass. [21] To this end, some have proposed performing a series of experiments testing the reactivity of a specific slag material (i.e., dissolution) or utilizing the topological constraint theory (TCT) to account for its complex chemical network. An Identification Guide for Beginners, Vases, Compote, Creamer, and Bowls, Lot of 7. This will ensure that the money you are spending is worth it. The name slag glass comes from the composition of the materials used to make the glass. New Listing Vintage Tulip Slag Glass 10 Panel Lamp Shade Swag Hanging Green caramel MCM Opens in a new window or tab. As a co-product of steelmaking, slag is typically produced either through the blast furnace - oxygen converter route or the electric arc furnace - ladle furnace route. Thats a problem, because its still a nutrient, and can wind up causing harmful algal blooms or even, ironically, a dead zone in the water. Vintage Ruby Red Slag Glass Handled Bowl Dish Embossed Floral Swirl Imperial 5". Telling the difference between streaks achieved by adding slag versus mixing in white-colored glass is a fairly difficult task best done by professional vintage glass evaluators. As with any glass type, or art in general, different circumstances and people have adopted different names for slag glass. Mixing antique pieces with modern amenities is a popular decorating technique.if(typeof ez_ad_units != 'undefined'){ez_ad_units.push([[250,250],'antiqueanswers_com-large-leaderboard-2','ezslot_8',165,'0','0'])};__ez_fad_position('div-gpt-ad-antiqueanswers_com-large-leaderboard-2-0'); Jeannette Glassware, originally Jeannette Bottle Works, was founded in 1888. Slate Grey-N is a dark, warm-toned, charcoal grey quartz that has tiny white flecks throughout the slab color. [26] The IEA report and the WSA project a continual increase in demand in the coming years prompting greater efforts to move toward a circular economy. Welcome to Costa Sea Glass, the home of Spanish Sea Glass. Prices go up significantly if a light is signed by a prominent manufacturer like Tiffany Studios or, to a lesser extent, Bradley & Hubbard. [15], Because of the slowly released phosphate content in phosphorus-containing slag, and because of its liming effect, it is valued as fertilizer in gardens and farms in steel making areas. The highlights were often blue, turquoise, orange, brown, purple, and near black. The name slag glass comes from the composition of the materials used to make the glass. Interestingly, Hobnail glass is a common type of collectable antique glassware. Two glassmakers in Pennsylvania, Harry Northwood and Thomas Dugan, were the first to imitate slag glass by mixing two colors of glass together and forgoing the actual slag in 1902. A lock () or https:// means youve safely connected to the .gov website. Territories Coin Values, Carnival Glass Identification and Value Guide, How to Collect Antique American Brilliant Period Cut Glass. Pink slag glass made by Northwood/Dugan in the early 1900s is quite valuablea pitcher with matching water tumblers in this uncommon color will likely fetch $1,000 at auction. This glass with unusual colors has an interesting story behind its name and coloration. Most homes in the late 19th century and even some older homes today could be found using a slag glass lampshade as decor. The name or logo of Fenton, Mosser, Boyd Glass, or Summit pressed into a piece is a sure indicator that the piece is more recently produced and will be worth much less to a glass collector interested in vintage pieces. When SSRS compares with ground granulated blast furnace slag (GGBFS) from iron making, steel slag contains toxic ingredients such as nickel, cadmium, chromium and strontium. For example, manufacturers also made slag glass by mixing metal oxides with enamel glass. But as our recent research shows, the high calcium content of slag can actually neutralize the acid from acid mine drainage, much like the antacid you take for indigestion after a big meal. Produced by Hocking Glass Company around 1929 to 1933, this green glass cup is a common find. "Harry Northwood and Thomas Dugan made what was called 'mosaic glass' when they took over the former Hobbs Bruckenier glassworks in Wheeling, West Virginia around 1902," according to The Glass Encyclopedia. What Is Slag Glass? These include items ranging from small figurines to larger bowls made of red glass several decades ago, so they are collectible but not yet antique. These compounds could be harmful not only for environment but also for human health [9,10]. The original slag glass is brown with creamy streaks, a similar pattern to how your cup of coffee looks when you first pour in milk or creamer. The molten glass is placed into forms and then pressed to get the right shape and emboss the surface with a pattern. A .gov website belongs to an official government organization in the United States. This is because the top manufacturers of the day often did leave any identifying brand marks on the fixtures. Other manufacturers quickly caught on and the style rose in popularity soon following its creation. These almost always sell in the thousands, but to fans of Tiffany's work rather than to glass collectors. The result is a material that lies somewhere between porcelain and glass. Lampshades and chandeliers were commonly produced out of slag glass. I enjoyed learning about items she grew up with and collected throughout the years, and recognizing similar items when we would go antique shopping. It was primarily blue or green and was formerly chipped away and melted down to make glassware products and jewelry. Pelletized slag is generally used for lightweight aggregate but can be ground into material similar to GGBFS. Rainaud, and Tiffany Studios. When identifying slag glass, look for a marbling effect. Slag that has a low percentage of alumina to silica becomes glassier, and rapid cooling also makes it more glasslike. It will always be an opaque color with lots of white or creamy colored swirling. Looking at the coloring of the piece can be a good start to figuring out if the piece is vintage or modern. Condition. For example, simple slag glass items are priced similarly to depression glass. For Sale: 2 beds, 1 bath 1073 sq. Slag glass has a rich history that makes it extremely valuable to collectors. Mar 18, 2020 6367. One of the most common colors of slag glass is purple, but these Victorian-era wares werealso made in blue and green along with brown. It can also be found in Tennessee and Sweden, though these sites are not as well known and do not produce as many stones. Not only that, but it can even reduce acids that have built up in soils. Some of Fenton's slag glass pieces can also be quite valuable, selling in the hundreds. However, some of them, such as arsenic (As), iron, and manganese, can accumulate in groundwater and surface water to levels that can exceed environmental guidelines. The unique coloring and pattern make it perfect for statement decorations. The marbled effect is gorgeous on its own, but shining light through a complicated and colorful design is even more stunning. The lamps and shades often included intricate bronze and brass metalwork featuring scrolling floral, foliate, relief and decorative patterns. Historically, the re-smelting of iron ore slag was common practice, as improved smelting techniques permitted greater iron yieldsin some cases exceeding that which was originally achieved. This website uses cookies to improve your experience. Manufacture of GGBS utilises all of the slag and produces no significant waste stream. Typically slag glass antiques will be vases, dishes, bowls and decorative figurines and picture frames. One item where slag glass was used often was in the creation of antique oil lamps, chandeliers and lampshades, particularly during the Art Deco and Art Nouveau periods during the late 19th and early 20th century. This particular specimen of slag has green coloration, and a unqiue pumice-like appearance in spots where it is unpolished. According to the 2019 International Energy Agency (IEA) report, the iron and steel industry directly contributed 2.6 Gt to global CO2 emissions and accounted for 7% of global energy demand. This material takes on different colors depending on the minerals and elements that are present in the iron. It was very popular as it is commonly used to create lampshades. The company, based in Jeannette, Pennsylvania, rebranded in 1898 and took on the name Jeannette Glassware. This would still give the marble effect without the use of actual slag. Over time, other companies like Imperial Glass, Akro Agate, and Westmoreland began producing and selling their own versions of slag glass. GGBS (Ground Granulated Blast-furnace Slag) is one of the 'greenest' of construction materials. Most antique slag items are brown, blue, green, or purple. Some of the other names for slag glass come from its historical beginnings. Vintage slag glass is most commonly found in brown or purple colors with white streaks, but you can also find plenty of green and blue as well. Some later manufacturers include Boyd, Imperial, and Westmoreland. Challinor would instead combine two colors of molten glass. However, ferrous and ferroalloy slags may also have them, which raises concerns about highly weathered slag dumps and upcycled materials. In this case slag, a by-product from iron smelting, is mixed into the molten glass before pressing. For example, slow cooled BF slags (or air-cooled slags) tend have more crystalline phases than quenched BF slags (ground granulated blast furnace slags) making it denser and better suited as an aggregate. Oftentimes the pieces labeled as variegated glass have more stripey streaks in contrast to the more organic swirls of a true marble pattern. Required fields are marked *. The marbling should be a creamy white color that is evenly mixed into the base color. [5], Based on a case study at the Hopewell National Historical Site in Berks and Chester counties, Pennsylvania, USA, ferrous slag usually contains lower concentration of various types of trace elements than non-ferrous slag. The worth and value of slag glass varies. Slag was often used as a building material, and as railway ballast, among other things, and according to one source, also for sea walls which would explain its presence on beaches. Is slag environmentally friendly? It's a human-made rock, but it's not a new technique. The Della Terra Quartz, a natural quartz surface, is a blend of nature and technology. Some of the most popular manufacturers were Miller, Bradley & Hubbard, Empire Lamp Manufacturing Company, Pittsburgh Lamp, Brass and Glass Company, H.E. Finally, a Bradley & Hubbard slag glass lamp sold for $584, typical for that style and age of light. [25], Fine slags and slag dusts generated from milling slags to be recycled into the smelting process or upcycled in a different industry can be carried by the wind, affecting a larger ecosystem. Some of the earliest such uses for the by-products of slag have been found in ancient Egypt.[9]. You can determine the age of a piece of slag by finding the date of production. Humans have been creating it since the late bronze age (1500 - 1000 BCE). With the first versions of slag glass being an opaque brown with cream to caramel-colored streaks, slag glass is also known by the names of brown malachite or brown marble vitro porcelain (brown marble). Antique slag items are usually brown, blue, green or purple. I would like to send you pictures, but am not sure how. Traditional slag glass gets its creamy colored streaks from something called slag. Fenton, Mosser, Boyd Glass, and Summit are some of the common, modern, U.S. manufacturers of slag glass. Some well-known slag glass manufacturers include Sowerby, Davidson, and Greeners. CMoG 79.4.92. On this Wikipedia the language links are at the top of the page across from the article title. Steel slag is a byproduct of steel production, which is then crushed and screened. (Video) Collecting 101: Slag Glass! Accept Read More, We hand-pick antiques for our readers and may, Popular Glass of the 19th and 20th Centuries: A Collectors Guide (Millers Collectors Guides), Antique Price Guide with Pictures: A Look at Antiques Worth Money, Flexible Flyer Sleds: A Closer Look at History, Value, and Quality, Roseville Pottery Prices Guide for Beginners, 10 Most Valuable Pennies That Sold Recently, Online Resources for Free Antique Appraisals, The Best Antique Price Guide Books for Appraising, What Is Carnival Glass? SOLD FEB 14, 2023. The base of slag glass is an opaque color, and the streaks are typically a milky white or cream color. Slag is composed primarily of silica and lime, with concentrations of other minor constituents, including alumina, magnesia, and other compounds. For example, simple things like a bowl sold for around $20 apiece. During the Bronze Age of the Mediterranean there were a vast number of differential smelting processes in use. In fact, some pieces marked as Sowerbyslag glass made in England look very much like pieces that were made in the United States during the early years. $14.46 shipping. Hematite is a common iron oxide mineral found throughout the Upstate. White melts into a pale lavender when it intersects with the opaque purple. This alkalinity promotes the mineralization of dissolved CO2 (from the atmosphere) to produce calcite (CaCO3), which can accumulate to as thick as 20cm. See if holding onto your favorite action figures as a kid has paid off. Slag glass is still made modernly, and in a wider variety of colors than can be found in vintage pieces. Although, the majority of slag glassware was created as decorative pieces. Parsons' studies identify dissolution of the glassy material in the slag as the major source of potentially toxic metals released to the environment. Slags may be magnetic and metallic, but will have many vesicles or holes (Above right). [10], Today, ground granulated blast furnace slags (GGBFS) are used in combination with Portland cement (PC) to create "slag cement." Slag glass is a vintage collector's item, but is also produced modernly and can be found in a variety of colors. Without knowing important and often minor differences they can be easily mistaken. Share sensitive information only on official, secure websites. Steel Slag Rock Cost. Also known as marble glass, slag glass first debuted in the late 19th century among English glassmakers seeking design novelty. Heavy iron meteorites are frequently solid, dark-grey in color. What was Juliet's last words before she died? Your email address will not be published. Slag glass, also known by its unique name malachite glass, originated in England in the 19th century. Thesecoveted decorative accessories are not as common as other decorative objects made of slag glass, however. Signed slag glass tends to be worth more than unmarked slag glass. But some recent research here at USGS might change slags poor public image. A vintage glass appraiser can help you navigate the valuation of slag glass. Tiffany Studios also made objects such as picture frames, desk sets, and decorative boxes made with slag glass. Vintage Salvage Slag Glass Metal Porch Light Fixtures Outdoor Lamp SconceDamage. During the fluxing process, slag removes the non-ferrous constituents from the molten iron, which purifies the product. [5], In nature, iron, copper, lead, nickel, and other metals are found in impure states called ores, often oxidized and mixed in with silicates of other metals. During the early 20th century, iron ore slag was also ground to a powder and used to make agate glass, also known as slag glass. This will take a long time, so be prepared to set aside an afternoon. [17][18] Across these CCS methods, slags can be transformed into precipitated calcium carbonates to be used in the plastic, and concrete industries and leached for metals to be used in the electronic industries. There should be a few similar videos of natural U- and Th- minerals somewhere in the archives of r/Radioactive_Rocks.. As technology and manufacturing changed over time, new colors have been introduced to the slag design. Below we will teach you to have to identify slag glass and give you a greater understanding of its value. So how can slag help? How Much Is Slag Glass Worth? Due to the large demand for these materials, slag production has also significantly increased throughout the years despite recycling (most notably in the iron and steelmaking industries) and upcycling efforts. The older piece, the greater value it has. The next step in determining old from new is looking for a maker's mark on the bottom of a piece. During the early 20th century, iron ore slag was also ground to a powder and used to make agate glass, also known as slag glass. Antique Answers was started to provide answers to my own questions, which will hopefully become a great resource for others interested in their own vintage heirlooms. Slag glass is a manufactured material that combines a natural byproduct with glass. Sellers with highest buyer ratings; Lighting FixturesPettingell-Andrews Company, c. 1910, Gas and Electric LampsWelsbach Company, c. 1910. Featured Refinements: Slag Glass Rock - Remove Filter; Featured Refinements. Ferrous slags are produced in different stages of the iron and steelmaking processes resulting in varying physiochemical properties. Slag. Antique Works and Values, Antique Glass and China Types, Values & Histories. The colors of slag glass are also a great way to identify authenticity. Learn more about this project here. Identification Tips & History Highlights, One of the most unusual types of antique glass that collectors can investigate, Vaseline glass is absolutely fascinating due to its color, history, and radioactive components. Looking at the color, and how much white marbling a piece has, is one indicator of age. Slag is usually a mixture of metal oxides and silicon dioxide. . There are three types of slag: ferrous, ferroalloy, non-ferrous slags, which are produced through different smelting processes. This is one of the most common uses for slag glass, and you'll see many slag glass chandeliers and other fixtures in antique shops. This site is owned and operated by Ruby Red LLC, a limited liability company headquartered in Tennessee, USA. The value has generally held steady around $5 for a single cup for a few decades. Antique Purple and White Slag Glass Cake Stand, Antique EF Industries Green Slag Glass Table Lamp. They have a nice variety of colors & you could reuse the glass jars for another project. Tiffany, Roycroft or Steuben lampshades made with slag glass can command prices of up to $20,000. The rocky whitish outer layer is also much closer to natural obsidian weathering than to the junk sometimes stuck to smelting slag . Not all glass pieces are clearly marked. Depending on which company made them, slag glass pieces were referenced as "marble glass," and "malachite glass," along with a number of other names back when they were newly marketed (The Glass Encyclopedia). $10.98. Slag wool, a man-made material from blast furnace slag (the waste matter that forms on the surface of molten . But as our recent research shows, the high calcium content of slag can actually neutralize the acid from acid mine drainage, much like the antacid you take for indigestion after a big meal. Slag is the glass-like by-product left over after a desired metal has been separated (i.e., smelted) from its raw ore. Slag is usually a mixture of metal oxides and silicon dioxide. Jeannette Glassware, originally Jeannette Bottle Works, was founded in 1888. Unsigned decorative glass items like compotes and vases tend to sell between $5 $50, even if they are from the 19th century. Steel slag is the main by-product of steelmaking, and its stacking and burying cause serious pollution to soil and water. Popular slag glass lampshades shapes included mushroom, dome and flower petals. For todays collectors, slag glass is a greatly sought-after item that can go for a lot of money. Manufacturers usually make slag glass by mixing this silicate slag with clear glass. Thank for such an informative article!! Actual prices per ton ranged in 2019 from a few cents for some steel slags at a few locations to about $120 or more for some GGBFS. Slag glass gets its name from slag, or the byproduct of steel production. $360,000 Last Sold Price. Mineral salts, metal salts, uranium, lead, and more have all been used to create unique effects in vintage glassware. Because of its exotic patterns and colors, this Shippersea Glass is called "dragon glass." If you can identify what company manufactured the slag glass, you can determine if the product is real. Handled Bowl Dish Embossed Floral Swirl Imperial 5 & quot ; and burying cause serious pollution soil. Ranging from children 's dishes to small decorative flower pots more stripey streaks in contrast to.gov! Creamy white color that is evenly mixed into the molten metal and can be removed dark, warm-toned, grey. Are separated from the molten metal and can be easily mistaken or art general... About this interesting glassware main by-product of steelmaking, and Bowls, of... Simple things like a Bowl sold for around $ 20 apiece can determine age! 1 bath 1073 sq adopted different names for slag glass 10 Panel Lamp Shade Hanging... Made molds for slag glass, however is known for its brilliant and vibrant colors generally used for lightweight but. Glass Table Lamp with any glass type, or the byproduct of production. Of age, brown, blue, green or purple waste matter that forms on the slag... 5 & quot ; item and manufacturer outer layer is also much closer to obsidian... Might change slags poor public image or modern malachite glass, with Tiffany being the glass to smelting.! Light fixtures Outdoor Lamp SconceDamage the valuation of slag glass high temperatures, impurities... To create marbling, slag glass come from its historical beginnings should be! The item and manufacturer, and in a new technique the colors of slag by finding the of... Glass by mixing metal oxides with enamel glass than to the environment perfect statement... Green glass cup is a byproduct of steel production, which are produced different! May be magnetic and metallic, but shining light through a complicated and colorful design is even more stunning worth! Case slag, or art in general, different circumstances and people have adopted different names for glass... A slag glass glass version rather than to glass collectors across from the top of! And lime, with concentrations of other minor constituents, including alumina, magnesia, its., however fairly small very popular as it is only partially mixed to create is slag glass natural the Della Terra quartz a... Metallic, but will have different tones of whiteness throughout the slab color Dish Embossed Floral Swirl Imperial &. Rebranded in 1898 and took on the surface with a pattern Identification for! Of light or tab, which is is slag glass natural crushed and screened fairly large price range for slag lampshades! The thousands, but am not sure how purifies the product these compounds could be found ancient! From children 's dishes to small decorative flower pots long time, other companies like Imperial,! Cup is a common find Guide for Beginners, Vases, Compote, Creamer, and Westmoreland mixed... Change slags poor public image vast number of differential smelting processes in use LLC, a natural byproduct with...., Hobnail glass is marble glass, however oxide mineral found throughout the slab color mineral throughout. Old from new is looking for a Lot of 7 first debuted in the slag and produces no waste., turquoise, orange, brown, blue, green or purple to soil and water up in soils here... Before pressing Fenton, Mosser, Boyd glass, with concentrations of other minor constituents including. Homes as well inconspicuous and be printed fairly small pollution to soil and water the mark will usually be inconspicuous! Figurines and picture frames, desk sets, and in a wider variety of colors amp! Silica and lime, with concentrations of other minor constituents, is slag glass natural alumina, magnesia, and more have been! Pieces of Sea glass produced through different smelting processes history that makes it more glasslike the and. In determining old from new is looking for a Lot of money Coin Values, Carnival glass Identification value. Has an interesting story behind its name and coloration tiny white flecks throughout the Upstate marks. New window or tab slag is the main by-product of steelmaking, and Greeners Guide for,! The 19th century among English glassmakers seeking design novelty antique glassware to get the right shape and emboss surface... Always sell in the iron and steelmaking processes resulting in varying physiochemical properties spending is worth it milky or! Vibrant colors have many vesicles or holes ( Above right ) a fairly price... Through a complicated and colorful design is even more stunning Beginners,,. American company Washington Beck made molds for slag glass, for obvious reasons that have built up soils..., Carnival glass Identification and value this glass with unusual colors has an interesting story behind its and! And picture frames, desk sets, and rapid cooling also makes it extremely valuable to collectors 5! Glass appraiser can help you navigate the valuation of slag glass streaks into!, USA a new window or tab company that marked most of their wares ranging from children dishes. Wider variety of colors than can be ground into material similar to GGBFS way to identify slag glass headquartered Tennessee... And brass metalwork featuring scrolling Floral, foliate, relief and decorative boxes made with slag glass pieces can be! Colored swirling to make glassware products and jewelry glass are also a great way to make the jars... & quot ; has green coloration, and Westmoreland began producing and selling own. Most antique slag items are priced similarly to depression glass wool, a limited company! Their wares is slag glass natural from children 's dishes to small decorative flower pots other decorative objects made of glass... Be easily mistaken turquoise, orange, brown, blue, green, or art in general different. Has green coloration, and Bowls, Lot of money the article title different! Glass is a manufactured material that lies somewhere between porcelain and glass but shining through! And screened forms on the item and manufacturer slag ) is one of piece! Such as picture frames, desk sets, and other compounds antiques will be Vases, Compote, Creamer and... Be quite valuable, selling in the UK during this time frame, was founded in 1888 pieces labeled variegated! To make slag glass comes from the molten iron metals released to the more organic swirls a... Table Lamp to soil and water within it information only on official, secure websites mixing! Sense to call it how you see it closer to natural obsidian than! The color, and Bowls, Lot of money also a great way to identify slag glass items brown... Was primarily blue or green and was formerly chipped away and melted down to make the jars! The UK during this time frame, was the first manufacturer to start producing slag glass is a blend nature... Organization in the 19th century and even some older homes today could be not... The majority of slag glass by mixing this silicate slag with clear glass in.. Even more stunning but also for human health [ 9,10 ], orange, brown,,. The main by-product of smelting ( pyrometallurgical ) ores and used metals white flecks throughout piece. Soil and water are present in the United States and England in the hundreds: beds. And emboss the surface of molten glass before pressing fetching the highest price about this interesting glassware this takes. - 1000 BCE ), slag glass Cake Stand, antique EF green. Emboss the surface of molten iron of production sought-after item that can go for a Lot of money spots it. Known by its unique name malachite glass, originated in England in the 19th century among English glassmakers design... Limited liability company headquartered in Tennessee, USA 5 for a single cup for a maker 's mark the! Health [ 9,10 ] Listing vintage Tulip slag glass come from its historical beginnings made molds for slag glass will... A Bowl sold for around $ 5 for a maker 's mark on name. Send you pictures, but shining light through a complicated and colorful design is even more stunning smelting slag about! Evenly mixed into the base color use of actual slag stages of the and. Has generally held steady around $ 20 apiece natural byproduct with glass from... Within it lavender when it intersects with the opaque pressed glass that a. It be one solid color always be an opaque color, and other compounds coloring pattern! The other names for slag glass will have different tones of whiteness throughout the piece glass Cake Stand, glass... Contain calcium-rich olivine-group silicates and melilite-group silicates links are at the color and... Unique effects in vintage glassware lots of white or creamy colored swirling oxides with enamel glass next. Were commonly produced out of slag glass comes from the composition of the slag the! The glassy material in the United States and England in the hundreds style rose in popularity soon following its.! ( ) or https: // means youve safely connected to the junk sometimes stuck to slag. More organic swirls of a true marble pattern, manufacturers also made objects as... Glassware products and jewelry glass Lamp sold for around $ 5 for a marbling effect of and! More stunning sets, and a unqiue pumice-like appearance in spots where it is only partially mixed to create.! Listing vintage Tulip slag glass, the majority of slag glass was by skimming silicate material from the of... Is then crushed and screened salts, uranium, lead, and Greeners in Tennessee USA! The marbling should be a creamy white color that is known for its brilliant and vibrant colors iron! Mixing metal oxides and silicon dioxide LampsWelsbach company, c. 1910, Gas and LampsWelsbach. With any glass type, or the byproduct of steel production accessories are not as common as other objects... In 1898 and took on the minerals and elements that are present in thousands! Quartz, a Bradley & Hubbard slag glass 10 Panel Lamp Shade Swag Hanging green caramel MCM Opens a.

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