Definition of ruby glass in US English:

ruby glass


  • Glass colored red by the inclusion of specific impurities such as metal oxides or gold.

    • ‘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.’
    • ‘The art of incorporating this liquid gold into ruby glass is attributed to German glassmaker Johann Kunckel in the late seventeenth century.’