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- Other materials can be added to produce different colours or properties. Glass can also be coated, heat-treated, engraved or decorated.
- Color in glass may be obtained by addition of electrically charged ions (or color centers) that are homogeneously distributed, and by precipitation of finely dispersed particles (such as in photo chromic glasses).
- Ordinary soda-lime glass appears colorless to the naked eye when it is thin, although iron(II) oxide (FeO) impurities of up to 0.1 wt%[11] produce a green tint, which can be viewed in thick pieces or with the aid of scientific instruments.
- Further FeO and Cr2O3 additions may be used for the production of green bottles.
- Sulfur, together with carbon and iron salts, is used to form iron poly sulfides and produce amber glass ranging from yellowish to almost black.
- A glass melt can also acquire an amber color from a reducing combustion atmosphere. Manganese dioxide can be added in small amounts to remove the green tint given by iron(II) oxide.
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