The natural color of glass is green, because sand has iron oxide or rust in it naturally. To change the color, a metal must be added. Below is a list of metals and the colors they make:
Manganese makes Clear
Cobalt makes Blue
Carbon makes Brown
Silver makes Yellow
Tin makes White
Copper or Gold makes Red
Manganese makes Clear
Cobalt makes Blue
Carbon makes Brown
Silver makes Yellow
Tin makes White
Copper or Gold makes Red
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