Adding colored glass to clear molten glass.

Glass has been used as an artistic medium since 3,000 BC. Then, as now, glass was created by melting a mixture of silica sand and lime. Color is added to clear glass by adding metallic oxides. Copper, for instance, creates green or blues tones. Manganese creates purple. Colors like red, orange or yellow are made by adding gold or silver.
Adding the colored glass to the outside of the working piece will coat it in the colors, allowing for a myriad of designs not otherwise possible.

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