Glass colored red by the inclusion of specific impurities such as metal oxides or gold.
- The art of incorporating this liquid gold into ruby glass is attributed to German glassmaker Johann Kunckel in the late seventeenth century.
- Even before that, the island was shrouded in legend after alchemist Johannes Kunkel tried to make gold there in the 17th century, producing ruby glass instead.
- Others were ambrotypes, a related antique method in which the original plate is backed with ruby glass or some other dark material that reverses the negative image.
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