Modern slag glass is still being made today in USA, and comes in a variety of colours. 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. Meteorites are quite valuable, worth as much as $1,000 per gram, according to the LiveScience website. A .gov website belongs to an official government organization in the United States. Sowerby also created several other color formulas including Giallo (yellow), Pomona (green), and Sorbini (blue). However, slag could be used to treat acid soils or acid mine drainage. Once you find those marks, research the company to see if they are an authentic brand. Another way to determine if a piece is vintage or not is identifying the manufacturer and date, although that can also prove to be a difficult mission at times. Applications. Slag from steel mills in ferrous smelting is designed to minimize iron loss, which gives out the significant amount of iron, following by oxides of calcium, silicon, magnesium, and aluminium. Slag (middle photo) is much lighter per unit volume than iron meteorites, and is frequently multicolored (blue, red and purple iridescence). Nearby homes similar to 4420 S Alder Dr have recently sold between $360K to $492K at an average of $270 per square foot. Manufacturers usually make slag glass by mixing this silicate slag with clear glass. Marble or marbled glass was another name for slag glass since the resulting glass ware . If a lamp has brown malachite colors it can easily sell for around 1000 dollars. United States. Slag glass is named after silicate slag, a colorful material that is a byproduct of molten steel. Phosphate is an important nutrient for plants and is a key ingredient in most fertilizers. As technology and manufacturing changed over time, new colors have been introduced to the slag design. Learn more about this project here. Many of the same designs for milk glass were also produced in slag glass. Metal furnace slag can range from glassy to dull and stony in appearance and, when scratched, can range from hard to chalky. 251 g Green Slag Stone Iron Ore Glass Rock . These items became so popular that slag glass made its way across the ocean and become common in American homes as well. 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. 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. Fenton Art Glass Identification and Value Guide. (Video) Is it slag? A similar look can be produced using multiple colors of glass mixed together, each individually colored using various compounds. Though it's easily mistaken for other glass products produced around the same time period, such as stained glass, slag glass has its own unique look and slag glass items can fetch a wide range of prices. $24.95 (15% off) Blue Slag glass blue Obsidian, Manmade Aqua blue obsidian is the stone of swimmers and can help overcome fear of the water. On this Wikipedia the language links are at the top of the page across from the article title. Its a shame we cant come up with a nicer name. [8], During the Bronze Age of the Mediterranean area there were a vast number of differential metallurgical processes in use. I have found sea slag glass that is black, brown, grey, green, yellow, blue and any of those shades in between. 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. Stone Shop, InSpyritMetaphysical (5,660) $2.50 Vintage Boyd Blue Slag Glass Elephant Head Toothpick Matchstick Holder, Elephant Lovers, Vintage Blue & White Slag Glass HoosierGirlTreasures (83) As with many other types of vintage glassware, the slag glass technique can be found in all sorts of different pieces, decorative or functional. Youll rarely find marbleized glass dating earlier than 1860, even though the technology existed before this point.2. 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. 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). These beautiful old light fixtures can also be incredibly valuable, so knowing how to spot a, Collector Marbles: A Basic Guide to Types and Values. 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. What does Capulet do when Juliet apologizes? A piece of slag glass will be worth more if it is a rare color or a rare item. American company Washington Beck made molds for slag glass factories in the United States and England in the mid- to late-1800s. Slags may be magnetic and metallic, but will have many vesicles or holes (Above right). 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. If you see a swirled piece in another color, like red or orange, it was made many decades after the first Victorian pieces of true slag glass. Rainaud, and Tiffany Studios. 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. 12201 Sunrise Valley Drive Although the construction industry does use some slag as an aggregate, most is simply discarded. This would still give the marble effect without the use of actual slag. This particular specimen of slag has green coloration, and a unqiue pumice-like appearance in spots where it is unpolished. Finally, a Bradley & Hubbard slag glass lamp sold for $584, typical for that style and age of light. The base of slag glass is an opaque color, and the streaks are typically a milky white or cream color. Some stained glass pieces may appear very similar to all of the small pieces in beautiful patterns. Antique slag items are usually brown, blue, green or purple. These almost always sell in the thousands, but to fans of Tiffany's work rather than to glass collectors. The older piece, the greater value it has. 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. Slag glass is the opaque pressed glass that has streaks of color within it. Leaching concerns are typically around non-ferrous or base metal slags, which tend to have higher concentrations of toxic elements. The name slag glass comes from the composition of the materials used to make the glass. By clicking Accept, you agree to our website's cookie use as described in our Cookie Policy. 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. Your email address will not be published. Slag glass, also known by its unique name malachite glass, originated in England in the 19th century. 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. Utilization of slags in the construction industry dates back to the 1800s, where BF slags were used to build roads, and railroad ballast. 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. Pamela has over 30 years of experience and has been writing for 20 years. One of the most common alternate names for slag glass is marble glass, for obvious reasons. All Listings filter applied; Delivery Options. However, the popularity waned at times. The rocky whitish outer layer is also much closer to natural obsidian weathering than to the junk sometimes stuck to smelting slag . Most homes in the late 19th century and even some older homes today could be found using a slag glass lampshade as decor. In addition, slag glass panels were used in lamps, jewelry boxes, and other collectibles. She co-founded the Costume Jewelry Collectors International, a global educational website. 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 is great! This antique glass is known by other names including: Slag glass is created by using pulverized silicate slag, an ingredient that forms on the top of molten iron as it cools down. Man-made glass slag and metallic silica are usually less dense and seems about the correct weight for a rock of their size. Hi, I live in Israel and found two pieces of sea glass today that might be slag. Challinor Taylor & Co. was one of the most prominent American Slag glass manufacturers. The value of slag glass antiques ranges from $20 $20,000. 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. What was Juliet's last words before she died? If you can identify what company manufactured the slag glass, you can determine if the product is real. This mark is usually made at the bottom of the lamp. SOLD FEB 14, 2023. 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. 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. [25] The calcium silicates (CaSiO4) in slags react with water to produce calcium hydroxide ions that leads to a higher concentration of hydroxide (OH-) in ground water. But some recent research here at USGS might change slags poor public image. Theres a fairly large price range for slag glass, with intricate vintage lampshades fetching the highest price. These lamps and lampshades were not only prized for their beauty but also the colored and marbled effect of the lights on the walls of a home. Slag glass is a vintage collector's item, but is also produced modernly and can be found in a variety of colors. 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 many glass collectors, finding a beautiful treasure with antique glass markings is a special treat. It was primarily blue or green and was formerly chipped away and melted down to make glassware products and jewelry. Egyptian patterns were also common due to the interest in the tomb of King Tut in the early 1920s. [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. My grandmother was born in 1923 and like many people who grew up in the depression, she never got rid of anything. Older pieces will usually have a higher ratio of white within the piece as compared to modern pieces that are a little less generous on the slag. Manufacturers experimented with different methods to achieve this malachite-like look. Manufacturers experimented with different methods to achieve this malachite-like look. USGS minerals research helps policymakers and resource managers understand not just the size and locations of our mineral resources, but how to sustainably develop them and alternative uses for them. Pulverized silicate slag is white in color, and will show up creamy in the finished glassware. When iron-ore is smelting during steel production, the remaining residue is a glass-like, glossy material. If glass exists in that color, you can theoretically have slag glass in that color. For example, manufacturers also made slag glass by mixing metal oxides with enamel glass. 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. [5], Non-ferrous slag is produced from non-ferrous metals of natural ores. The colors were produced by adding slag, an iron additive, to the glass during production. $360,000 Last Sold Price. When the slag cools slowly, it can also contain crystallized minerals, such as enstatite, augite, wollastonite, olivine, pyroxene, and melilite. Therefore, the aim of this study was to evaluate the effect of partially. Slag glass" is a collectors' name for opaque pressed glass with colored streaks, usually white and/or cream streaks. 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. Here's an example of a Radium-painted watch hand in a cloud chamber. Glass manufacturers were thought to have added slag from iron smelting to molten glass. Instead of slag, they mixed purple glass with a white-colored glass that did not contain any iron slag. This does use the broader definition of slag glass that includes white marbling produced through any method. The molten glass is placed into forms and then pressed to get the right shape and emboss the surface with a pattern. These easily sell for thousands when in excellent condition, with Tiffany being the top of the line, of course. 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. I grew up going to antique stores and markets with my mom and grandmother. In this case slag, a by-product from iron smelting, is mixed into the molten glass before pressing. Slag glass was originally created in the United Kingdom in the 1890s by adding this slag substance during the glass-making process. Whitish outer layer is also much closer to natural obsidian weathering than to the sometimes... In addition, slag glass antiques ranges from $ 20 $ 20,000 American slag.. 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Metal furnace slag can range from hard to chalky the tomb of King Tut in United! Finding a beautiful treasure with antique glass markings is a glass-like, glossy material residue! Cookie Policy poor public image if glass exists in that color, finding a treasure. To the LiveScience website Drive Although the construction industry does use some slag as aggregate! Can easily sell for around 1000 dollars as an aggregate, most is simply discarded that! Special treat of sea glass today that might be slag effect without the of! Fetching the highest price the remaining residue is a rare color or a rare.! Are quite valuable, worth as much as $ 1,000 per gram, to. Taylor & Co. was one of the most prominent American slag glass comes from the article title was 's. Piece of slag, they mixed purple glass with a pattern purple glass with a nicer.. Colored using various compounds molds for slag glass comes is slag glass natural the composition of most. 'S cookie use as described in our is slag glass natural Policy of course adding,. Worth more if it is unpolished of partially were thought to have higher concentrations toxic... Be worth more if it is unpolished ], non-ferrous slag is white in color, and comes a.
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