purple of Cassius

[kash-uhs, kash-ee-uhs, kah-see-uhs]
a purple pigment precipitated as a sol by the interaction of gold chloride and a solution of stannic acid and stannous chloride: used chiefly in the manufacture of ruby glass, ceramic glazes, and enamels.

1830–40; named after A. Cassius, 17th-century German physician

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