The different colours of glass is made by using the following ingredients added to the basic glass mixture:
Black - Iron and/or Manganese, Copper, Cobalt.
Blue - Copper and/or Iron, Chromium.
Green - Iron and/or Copper, Chromium.
Purple - Manganese and/or Nickel.
Red - Gold and/or Selenium, Copper.
Vaseline - Uranium.
White Opal - Tin and/or Arsenic and certain salts.
Yellow - Silver and/or Iron, Cerium.
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