purple of Cassius

[ kash-uh s, kash-ee-uh s, kah-see-uh s ]
/ ˈkæʃ əs, ˈkæʃ i əs, ˈkɑ si əs /

noun

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.

Origin of purple of Cassius

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