Hyalith
Glass Dictionary

Two varieties of glass, opaque black and opaque red, developed by the Bohemian glassmaker Jirí von Buquoy (1781-1851) and patented in 1817 and 1819 respectively.
Artwork Examples:
Two varieties of glass, opaque black and opaque red, developed by the Bohemian glassmaker Jirí von Buquoy (1781-1851) and patented in 1817 and 1819 respectively.