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Unless the raw materials are very pure, glass is normally green.
In order to change the colour of glass, one can decolourise the glass by adding colorants which produce the complementary colour to green.
The colour depends on the state of oxidation of the colorant, the composition of the glass and the thermal treatment.
| COLORANT | GLASS COLOUR/S |
| iron | green and aqua |
| iron and sulfur | amber |
| copper | light blue |
| cobalt | dark blue |
| manganese | Purple |
| tin and calcium | opaque white |
| lead plus antimony | opaque yellow |
| selenium | red |
| neodymium | purple |
| praseodymium | green |
| cerium | yellow |
| carbon and sulphur | amber, brown |
| cadmium sulphide | yellow |
| antimony sulphide | red |
| gold | red |
Sources: The Corning Museum of Glass and British Glass