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Stain
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The development of yellow and red glass stains in the early 19th C. by Egermann had a long and far-ranging impact on glassmaking. The stains were a much easier and cheaper alternative to casing or flashing glass, but produced much the same effect. You can usually tell when something has been cased by looking at cut areas: the colored top layer will be thicker and usually will blend into the colorless glass a bit (especially visible in shallow cuts). Often stain was used in areas that could not have been cased, such as cuts or facets. Stained glass tends to fade, as you can see on this example, a decanter by Fostoria. The fact that this is etched is a dead giveaway that it's stained.
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