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Glass is neither an element nor an alloy. It is actually a mixture. It is formed by mixing different proportions of sand, lime (calcium oxide) and other materials. Sometimes boric acid is added to it to make it inert to chemical actions, so as to use them for laboratory purposes. Colored glass is usually obtained by adding certain chemical compounds like ferrous nitrate for green color, copper nitrate for blue color, etc.

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17y ago

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