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A dispersion of microscopic metallic particles in a glass or ceramic matrix. The finely divided metallic particles, such as gold, silver or copper, produce visible colors. Examples are Gold ruby glass made by the dispersion of colloidal gold and Copper ruby glass made with copper or copper oxide. The particles must be big enough to produce color but small enough that the light is not than reflected by the metal. Some glass, such as Aventurine, has larger metallic particles which produce a metallic sheen or sparkle effect.

Synonyms and Related Terms

gold ruby glass; copper ruby glass

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