Cranberry glass
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Cranberry glass or 'Gold Ruby' glass is a red glass made by adding gold salts or colloidal gold to molten glass. Tin, in the form of stannous chloride, is sometimes added in tiny amounts as a reducing
Vintage cranberry glass bowl
The beaker with lid made from Gold Ruby is attributed to Johann Kunckel.
The Lycurgus Cup, a 4th-century Roman glass cage cup made of a dichroic glass
Lycurgus Cup
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The Lycurgus Cup is a Roman glass 4th-century cage cup made of a dichroic glass, which shows a different colour depending on whether or not light is passing through it: red when lit from behind and gr
Appearance when back-lit
When viewed in reflected light, as in this flash photograph, the cup's dichroic glass is green in colour, whereas when viewed in transmitted light, the glass appears red.
The Rubens Vase, an agate hardstone carving of c. A.D. 400
The satyr with the rock, in the new 2014 display