How do you color glass or get color in the glass?

Home Frequently Asked Questions (FAQ) Glass Information How do you color glass or get color in the glass?....

Minerals are used to color glass.  Many times he minerals and ratio of the minerals in the glass are considered a trade secret to the manufacturer of the colored glass.  Here are a few examples of what minerals help the clear glass turn color.

Cobalt Oxide: blue-violet

Cadmium Sulfide: yellow

Gold Chloride: red

Antimony Oxide: white

Sulfur: yellow-amber

Uranium Oxide: fluorescent yellow, green

Chromic Oxide: emerald green

Note, when any mineral is added to the glass it does change it COE (coefficient of expansion).  While the clear glass claims a COE of 33 the colored glass will also claim a COE 33.  But this is not true that they are the same COE33.  They are close but not the exact same.

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