Glasses: GoldstoneNot all glass is necessarily clear or transparent, and goldstone is just one such
Glasses: GoldstoneNot all glass is necessarily clear or transparent, and goldstone is just one such example of that. Neither gold, nor a stone, goldstone is a type of glass made in an oxygen reducing atmosphere, keeping the glass hot enough for metallic flecks of copper to form, but not melt.Most goldstone is composed of soda-lime glass or silica, and copper salts, as well as other chemicals that help reduce copper to its elemental form. The copper produces red goldstone, with flecks of metallic copper. However, other elements can be substituted for copper, creating a variety of colors. Cobalt creates blue goldstone, manganese purple, and green goldstone is made with chromium oxides. Goldstone dates back to centuries ago, perhaps as early as 12th or 13th century Persia (though its exact date of discovery is debated), and is also known as aventurine glass, or sometimes sandstone when used in watch dials. The first official process to create it came about in 17th century Italy.Finished products are usually polished, and carved into beads or substitutions for semiprecious stones, such as in jewelry. Sources: ( 1 - image 1 ) ( 2 - images 3 and 4 ) ( 3 ) Image 2. -- source link
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