Even before humans learned how to make glass, they were employing naturally formed glass (obsidian rock and fulgurites, which occur when lightening strikes sand) into knife blades, arrowheads, and jewelry. Manufactured glass is believed to have been invented in Mesopotamia and Egypt around 3000 BCE, and the eastern Mediterranean area was the world center of glassmaking for the next millennium. Warm glass, which is made by fusing different colors of glass in a glass kiln, was used in ancient Greek and Roman mosaics; and jewelry made of warm glass was valued as highly as gold.
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Using a Glass Kiln to Warm Glass is an Ancient Technique For Contemporary Design
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