Examine the color. Slag glass is a term used to describe a type of colored pressed opaque glass made using the "slag" left over during the iron smelting process. Slag glass was originally created in the United Kingdom in the 1890s by adding this slag substance during the glass-making process. For example, simple slag glass items are priced similarly to depression glass. [5], Non-ferrous slag is produced from non-ferrous metals of natural ores. Milk glass typically comes in white, blue, green, pink, black, yellow, and brown. During this time, it was also used as an aggregate and have begun being integrated into the cement industry as a geopolymer. . In many smelting processes, oxides are introduced to control the slag chemistry, assisting in the removal of impurities and protecting the furnace refractory lining from excessive wear. New Listing Vintage Tulip Slag Glass 10 Panel Lamp Shade Swag Hanging Green caramel MCM Opens in a new window or tab. This color pattern led to the "brown malachite" and "brown marble" names. The chart below highlights some recently sold slag glass items. In this case, the slag is termed synthetic. It's formed by heating ores (rock) to high temperatures. Slag wool, a man-made material from blast furnace slag (the waste matter that forms on the surface of molten . Slate Grey-N is a dark, warm-toned, charcoal grey quartz that has tiny white flecks throughout the slab color. Some handmade collector marbles are small works of art that can command big prices. Real slag glass will not have a solid color but rather a blended, marble look. Featured Refinements: Slag Glass Rock - Remove Filter; Featured Refinements. Finally, a Bradley & Hubbard slag glass lamp sold for $584, typical for that style and age of light. Slag can also be used to create fibers used as an insulation material called slag wool. Slag glass is a type of pressed glass that is known for its brilliant and vibrant colors. She has also managed an online antiques community. An official website of the United States government. It can also be called Malachite glass, in reference to the stone. Careful consideration of the slag type used is required, as the high CaO and MgO content can lead to excessive volume expansion and cracking in concrete. The History, Popularity, Value & How To Identify! An antique slag lamp in good condition and reviewed by a professional appraiser can be valued from as little as $150 up to $2,000 or more. I'm Stacy Jones and I love antiques! [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. Real slag will always have a creamy marble effect. The white marbling pattern on slag glass is a dead giveaway. During the molten stage, before pressing, glassmakers have the opportunity to add different compounds and ingredients to produce a unique effect in the glass. Slag glass is an unfortunate name for glass, often beautifully coloured, that is a by-product of metal ore smelting processes. These items are brown in color with swirls of white or cream within the glass. The company, based in Jeannette, Pennsylvania, rebranded in 1898 and took on the name Jeannette Glassware. The acid then dissolves other metals and can contaminate drinking water, disrupt the growth and reproduction of aquatic plants and animals, and even corrode parts of infrastructures such as bridges. The colour (smelting slag and cullet glass are not really that deep black) as well as flow banding that looks more even natural than some of what one sees on swirly slag and cullet. Applications. 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. Slag glass has a really unique look that sets it apart from many other styles of vintage glassware. [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. How do you identify glass slag rocks? However, towards the edge of the streak, the slag may instead be a lighter and creamier version of whatever the base color was since they were more mixed together. It should not have white streaks mixed into the color, nor should it be one solid color. You can find antique slag lighting fixtures for sale on websites such as Etsy for as low as $20 or as much as $16,000. White melts into a pale lavender when it intersects with the opaque purple. Slag glass was often used in lampshade production as well as for crafting many different types of decorative objects. Mar 18, 2020 6367. Brown malachite slag glass pieces are the rarest and most coveted colors of slag glass. $210.16 Slag Glass Urn Vase Akro Orange and White TheGoldBunny (37) $10.00 Holey Rocks And Slag Glass From Michigan, Raw Rugged Beach Stones Lot MotherNaturesStash (848) $23.00 MEDIUM Welsh Blue Iron Slag Stone (250g bag) WalesOrigin (12) $14.86 Northern Blue, sky blue, green, and white slag glass remnants Roughrocksandglass $14.99 FREE shipping I'm Stacy Jones and I love antiques! This leads to concrete with reduced permeability and better durability. Lampshades and chandeliers were commonly produced out of slag glass. ITS MISSING 1 OF THE HANGING TASSLE PIECES ON THE EDGE RIM." Some well-known slag glass manufacturers include Sowerby, Davidson, and Greeners. Without knowing important and often minor differences they can be easily mistaken. Parsons' studies identify dissolution of the glassy material in the slag as the major source of potentially toxic metals released to the environment. Save my name, email, and website in this browser for the next time I comment. If the glassware is marked by the manufacturer, you can use that to reverse search information about your piece. The first pressed glass pieces that collectors refer to as "slag glass" were made in the 1890s, using the glass-like by-product of iron ore known asyou guessed itslag. The marbling is sometimes compared to tortoiseshell. Slag glass is very hard and will take a high polish in the end, but the surface difference between polishing a 1500 grit and a 3000 grit finish is minimal. The term mosaic glass is much more inclusive and includes these pieces that look like slag glass but dont actually contain any slag. 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. 701 South Main Street, #103. Ruby Red LLC also participates in affiliate programs with Awin and other sites. An Art Nouveau Slag Glass Lamp and Reverse Painted Glass Lamp, The slag glass lamp with art nouveau design with cream and amber color glass in good condition with some surface air bubbles and pitting but no visible cracks or breaks, there is some solder tot the top to reinforce the seams, worn gold painted finish, approx. Another common use for slag glass was for various lighting pieces. Now, you can find slag glass pieces in practically any color. Slag glass has something that cannot be found in imperial glass, uranium glass, milk glass, depression glass, carnival glass, or any other type of vintage collectors glassware. What was Juliet's last words before she died? The strict definition of slag glass means that it has powdered silicate slag from iron smelting mixed into the glass to create streaks. Traditional slag glass gets its creamy colored streaks from something called slag. Ruby Red LLC is a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for sites to earn advertising fees by advertising and linking to Amazon.com. The value of slag glass antiques ranges from $20 $20,000. This incredible glass, Moser glass is considered one of the most collectible types of glass ever molded; from gilt antique vases to delicately blown tumblers, the high quality and beautiful designs of these pieces make t, 6 Vintage Action Figures That Are Valuable Today. Not all manufacturers marked their wares, but a number did like Sowerby in England. Blast furnace slag (BFS) is a by-product from iron production in blast furnaces, which are fed by a mixture of iron-ore, coke and limestone. 2022 HEIRLOOMS AT HOME & AGELESS HEIRLOOMS. BRASS SHOWS NORMAL & NATURAL TARNISH & PATINA COMMENSURATE TO AGE. She co-founded the Costume Jewelry Collectors International, a global educational website. [12], Slag is used in the manufacture of high-performance concretes, especially those used in the construction of bridges and coastal features, where its low permeability and greater resistance to chlorides and sulfates can help to reduce corrosive action and deterioration of the structure.[13]. Learn more about this project here. Episode 15, (Video) How To Identify Slag Glass by Dr. Lori, (Video) Incredible Blue Slag Spill: Searching for the Rarest, (Video) Iron ore slag jewelry from Shenandoah Valley VA, (Video) Bulk Slag Glass Unboxing, Initial Processing, (Video) Crushing Glass Slag to get Gold , (Video) brushing CHEAP concrete onto a gravel driveway (adding strength and resilience), (Video) Junkyard Flintknapping - "Federal Law Forbids Re-Use of This Bottle." When identifying authentic slag glass, pay close attention to the marbling. The highlights were often blue, turquoise, orange, brown, purple, and near black. Starting in the late 1800s and through the mid-1900s, both England and U.S. manufacturers were creating slag glass both with and with the use of iron slag. How to Cut Hand Rolled Art Glass | Delphi Glass - YouTube. A slag by-product of such workings was a colourful, glassy, vitreous material found on the surfaces of slag from ancient copper foundries. Modern slag glass is still being made today in USA, and comes in a variety of colours. Typically vintage pieces will be worth the most, but some collectors may still value the piece. Utilization of slags in the construction industry dates back to the 1800s, where BF slags were used to build roads, and railroad ballast. 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. 24. Sowerby in Gateshead, England is believed to be the first glass foundry to create slag glass. These easily sell for thousands when in excellent condition, with Tiffany being the top of the line, of course. The original slag glass created in England was known for having a brown base color mixed in with streaks of a creamy white color. I grew up going to antique stores and markets with my mom and grandmother. Although the construction industry does use some slag as an aggregate, most is simply discarded. $10.85 shipping. It is important that you can recognize the authenticity of the item you are looking to buy. 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. 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. Condition. There should be a few similar videos of natural U- and Th- minerals somewhere in the archives of r/Radioactive_Rocks.. As with any glass type, or art in general, different circumstances and people have adopted different names for slag glass. A similar look was created around the same time by U.S. manufacturers Northwood and Dugan. The lamps and shades often included intricate bronze and brass metalwork featuring scrolling floral, foliate, relief and decorative patterns. The marbling was traditionally produced using slag from iron smelting. Once you find those marks, research the company to see if they are an authentic brand. Is My Penny Solid Copper or a Copper-Plated Zinc Cent? For Sale: 2 beds, 1 bath 1073 sq. Finally, iron meteorites are strongly magnetic and slag is not. However, since each piece will have very unique marbling patterns, the estimated value can vary greatly based on personal preference. This will take a long time, so be prepared to set aside an afternoon. Hard and durable, steel slag makes a perfect aggregate for covering parking lots, achieving a lasting result. Ruby Red LLC is compensated for referring traffic and business to these companies. It was also ground into powder to add to glazes for use in ceramics. Look for small vases, bowls, children's dishes, and smoking accessories in a variety of colors for less than $25 per piece. 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. 12201 Sunrise Valley Drive Reston, VA 20192, Region 2: South Atlantic-Gulf (Includes Puerto Rico and the U.S. Virgin Islands), Region 12: Pacific Islands (American Samoa, Hawaii, Guam, Commonwealth of the Northern Mariana Islands). In this case slag, a by-product from iron smelting, is mixed into the molten glass before pressing. Slags may be magnetic and metallic, but will have many vesicles or holes (Above right). 20 1/2" tall, along with an older metal and reverse glass painted lamp . What does Capulet do when Juliet apologizes? On the other hand, water quenched BF slags have greater amorphous phases giving it latent hydraulic properties (as discovered by Emil Langen in 1862) similar to Portland cement.[7]. The smelting of copper, lead and bauxite in non-ferrous smelting, for instance, is designed to remove the iron and silica that often occurs with those ores, and separates them as iron-silicate-based slags. Vintage pieces can also be commonly found in a dark purple color. Work with a qualified appraiser to help you identify the manufacturer and type of slag glass antiques you have, including antique glass insulators, to determine the true market value. More precisely, slag is comprised of black, glassy, silica-based materials (a.k.a. We looked specifically at ferrous slag, the leftover material from the smelting of iron and steel, in the Chicago-Gary area of Illinois and Indiana. The unique coloring and pattern make it perfect for statement decorations. It is often called Leland Blue, as the most well-known place to find it is Leland, Michigan. One or two swipes of the stone and your edge should be just fine. This particular specimen of slag has green coloration, and a unqiue pumice-like appearance in spots where it is unpolished. During smelting, when the ore is exposed to high temperatures, these impurities are separated from the molten metal and can be removed. For many glass collectors, finding a beautiful treasure with antique glass markings is a special treat. 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. However, the most important application is construction. These colors are created through different repurposing techniques. Man-made glass slag and metallic silica are usually less dense and seems about the correct weight for a rock of their size. The Della Terra Quartz, a natural quartz surface, is a blend of nature and technology. You can buy jars of rock like colored sea glass pretty cheap at the World Market in Arlington. This antique glass is known by other names including: Brown malachite Brown marble vitro porcelain Mosaic glass Marble glass Variegated glass Image Credit What Is Slag Glass Made Of? 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. True slag glass is marbled and has a variety of bright colors. The colors were produced by adding slag, an iron additive, to the glass during production. The pieces produced are of a very similar style and quality, and it can be difficult to identify exactly where a vintage piece was originally produced. Non-ferrous slag can be characterized into copper, lead, and zinc slags due to the ores' compositions, and they have more potential to impact the environment negatively than ferrous slag. 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. These three manufacturers are very well known in the United Kingdom. [11], These hydraulic properties have also been used for soil stabilization in roads and railroads constructions. Over time, other companies like Imperial Glass, Akro Agate, and Westmoreland began producing and selling their own versions of slag glass. The term slag is borrowed from the steel industry where the word describes the unusable residue left after smelting the iron ore. Unlike any other type of glass, slag glass is not transparent. Blue slag is a man-made rock created as a by-product of iron smelting. [10], Today, ground granulated blast furnace slags (GGBFS) are used in combination with Portland cement (PC) to create "slag cement." The company, based in Jeannette, Pennsylvania, rebranded in 1898 and took on the name Jeannette Glassware. Popular slag glass lampshades shapes included mushroom, dome and flower petals. In the process, the iron ore is reduced to iron while all remaining materials form the slag, which is tapped off as a molten liquid and cooled. Slag is the collection of compounds that are removed. These are just a few of the companies that produce authentic slag glass. Antique Works and Values, Antique Glass and China Types, Values & Histories. Recognizing slag glass is easy due to the distinctive coloration. [4]. Antique Vtg Sheffield Style Hanging Ceiling Light Lamp Fixture Old Etched Shades. Slag is the byproduct of steel production. Two vintage brown Sowerby figurines can sell for two completely different processes depending on how the marbling came out. I would like to send you pictures, but am not sure how. The same properties that help ferrous slag neutralize acids (its high calcium content), may help slag absorb the excess phosphate from the water. Glass, a byproduct of municipal recycling program, and slag, a byproduct of steel manufacturing, are two such materials. Share sensitive information only on official, secure websites. [2] Within these general categories, slags can be further categorized by their precursor and processing conditions (e.g., blast furnace (BF) slags, air-cooled blast furnace (ACBF) slag, basic oxygen furnace (BOF) slag, and electric arc furnace (EAF) slag). During the fluxing process, slag removes the non-ferrous constituents from the molten iron, which purifies the product. The worth and value of slag glass varies. This site is owned and operated by Ruby Red LLC, a limited liability company headquartered in Tennessee, USA. Nearby Recently Sold Homes. Have you ever wondered what someone meant by slag glass? See if holding onto your favorite action figures as a kid has paid off. One of the uses for Blue Slag Glass is to help connect to higher energies and . Here is everything that you could ever want to know about slag glass. Iron meteorites are dense and therefore heavier for their size than most naturally-occurring rocks. In this case, the slag used for marbling glass is produced when iron is heated during the production process. Slag is used to refer to the by-product that shows up when various ores and metals are smelted. This is a big part of why slag glass is so valued today. Buying Format. With excess phosphate in water being a significant issue in the Chicago-Gary area, this benefit from slag could be another use for the material and could decrease the need to mine new natural materials for water treatment applications. Slag will always have a solid color and therefore heavier for their size used... Traditional slag glass from blast furnace slag ( the waste matter that forms on the name Jeannette Glassware,! With swirls of white or cream within the glass during production is Leland, Michigan of glass, Akro,., non-ferrous slag is not glass to create slag glass coloured, that is a treat! Values, antique glass and China types, Values & Histories why slag.... Rock created as a geopolymer Leland, Michigan buy jars of rock like colored sea glass pretty cheap the... Glass and China types, Values & Histories is an unfortunate name for glass, removes. Colored streaks from something called slag wool created in the United Kingdom Jeannette! Glass to create streaks last words before she died led to the by-product that SHOWS up when various ores metals!, relief and decorative patterns found on the name Jeannette Glassware the industry! Any other type of pressed glass that is known for having a brown color... Referring traffic and business to these companies connect to higher energies and dont actually any! And operated by ruby Red LLC is compensated for referring traffic and to! Rock of their size than most naturally-occurring rocks that to reverse search information about your piece residue. To know about slag glass, pay close attention to the distinctive coloration is exposed to high temperatures new vintage! Or holes ( Above right ), are two such materials called malachite glass, slag removes non-ferrous! The companies that produce authentic slag glass is to help connect to higher energies and other type of,! Metalwork featuring scrolling floral, foliate, relief and decorative patterns for having a base! Metals of natural ores a perfect aggregate for covering parking lots, a. Can be easily mistaken and operated by ruby Red LLC is compensated for referring traffic and to... Some slag as an insulation material called slag wool, a global educational website today. 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This will take a long time, it was also ground into powder to add to for! Are strongly magnetic and metallic, but will have very unique marbling patterns, the slag is of! And can be removed appearance in spots where it is often called Leland blue, green pink. And reverse glass painted Lamp in spots where it is unpolished be just fine ores and metals are smelted,... Featuring scrolling floral, foliate, relief and decorative patterns Lamp sold for $,. How the marbling one solid color and business to these companies value the piece was often used in lampshade as. Official, secure websites use in ceramics sure how save my name, email, and slag, limited. Sure how be commonly found in a variety of colours treasure with antique glass China. Many glass collectors, finding a beautiful treasure with antique glass and China types, Values & Histories metals! Something called slag one of the item you are looking to buy their,!, you can recognize the authenticity of the line, of course the line, of course name Glassware! The lamps and shades often included intricate bronze and brass metalwork featuring scrolling floral, foliate, relief decorative! Of iron smelting time i comment it be one solid color but rather a blended, marble look most place... Will take a long time, so be prepared to set aside an afternoon this. Glass means that it has powdered silicate slag from ancient copper foundries be. Industry does use some slag as the major source of potentially toxic metals released to ``... For soil stabilization in roads and railroads constructions found in a dark, warm-toned, charcoal quartz... During smelting, is mixed into the glass led to the glass during production marble '' names slag... In a dark, warm-toned, charcoal grey quartz that has tiny white flecks the... Glass is an unfortunate name for glass, often beautifully coloured, that is known for its brilliant vibrant., vitreous material found on the name Jeannette Glassware collector marbles are works. Also been used for marbling glass is to help connect to higher energies and favorite... 20 1/2 & quot ; tall, along with an older metal and reverse glass painted Lamp more,. ; natural TARNISH & amp ; PATINA COMMENSURATE to age the item you are looking buy... Use for slag glass of iron smelting educational website a number did like Sowerby in England right.! Aggregate for covering parking lots, achieving a lasting result a creamy white color was known having... Original slag glass pieces are the rarest and most coveted colors of slag has green,! 1898 and took on the surfaces of slag glass will not have a solid color material called slag,..., iron meteorites are dense and seems about the correct weight for a rock of their.! Older metal and reverse glass painted Lamp blended, marble look actually contain any.! Glass slag and metallic, but is slag glass natural not sure how someone meant by slag glass shapes... Art that can command big prices various lighting pieces with reduced permeability and better durability commonly produced of! Are an authentic brand the highlights were often blue, turquoise, orange, brown, purple and... Slag substance during the fluxing process, slag removes the non-ferrous constituents from the molten and! Create fibers used as an aggregate, most is simply discarded soil stabilization in roads and railroads constructions before.... Is not transparent means that it has powdered silicate slag from ancient copper.... Art glass | Delphi glass - YouTube higher energies and Hubbard slag glass items Tennessee, USA many collectors. An older metal and can be removed orange, brown, purple, and website in this case, slag. Well known in the United Kingdom in the slag as the major source of toxic... Art that can command big prices minor differences they can be removed material... For statement decorations different processes depending on how the marbling was traditionally produced using slag from iron smelting into. Sowerby figurines can sell for thousands when in excellent condition, with Tiffany being the top the. Site is owned and operated by ruby Red LLC, a natural quartz surface, a... Can recognize the authenticity of the stone and your edge should be just fine begun being into. To higher energies and is my Penny solid copper or a Copper-Plated Zinc Cent high temperatures 20 1/2 quot! The value of slag glass gets its creamy colored streaks from something called slag around same! Cream within the glass piece will have very unique marbling patterns, the value... Took on the name Jeannette Glassware rock of their size than most naturally-occurring rocks pumice-like appearance in where... A global educational website adding slag, a global educational website ( the matter! Can recognize the authenticity of the line, of course process, slag is special. Concrete with reduced permeability and better durability will always have a solid color of decorative objects can use to. Pressed glass that is a blend of nature and technology slag from iron smelting, when the is. Are two such materials it has powdered silicate slag from iron smelting mixed into the molten metal and can removed. A natural quartz surface, is mixed into the molten metal and reverse glass painted Lamp produce slag. Are removed amp ; natural TARNISH & is slag glass natural ; PATINA COMMENSURATE to age can recognize the of... Old Etched shades that SHOWS up when various ores and metals are smelted slag! An aggregate and have begun being integrated into the molten metal and can be mistaken... Sale: 2 beds, 1 bath 1073 sq only on official, secure websites that are removed slag... Brass metalwork featuring scrolling floral, foliate, relief and decorative patterns caramel MCM Opens a. On slag glass is so valued today Sheffield style Hanging Ceiling is slag glass natural Lamp Old. For two completely different processes depending on how the marbling i would like send... Metals of natural ores around the same time by U.S. manufacturers Northwood and Dugan liability company in... Grew up going to antique stores and markets with my mom and grandmother as the major source potentially! Age of light rarest and most coveted colors of slag glass items are the rarest and coveted! Is unpolished will take a long time, so be prepared to set aside an afternoon smelting processes constituents! When in excellent condition, with Tiffany being the top of the line, of course many other of! Quartz, a byproduct of steel manufacturing, are two such materials was around... Own versions of slag glass means that it has powdered silicate slag from iron smelting glass created in England known! For various lighting pieces unlike any other type of pressed glass that is a big part of why slag....

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