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Glass was originally formed from the solidification of acidic rocks ejected by volcanic eruptions. Around 3700 BC, the ancient Egyptians had already produced glass ornaments and simple glass vessels, which were only available in colored glass at that time. By around 1000 BC, China had begun to manufacture colorless glass. In the 12th century, commercial glass appeared and started to become an industrial material. In the 18th century, optical glass was developed to meet the needs of telescope production.
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