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单词 gold purple
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> as lemmas

gold purple
gold purple n. [after German Goldpurpur (1782 in the passage translated in quot. 1797)] now chiefly historical a purple pigment consisting of a colloidal mixture of metallic gold and tin( iv) oxide; = purple of Cassius n. at purple n. 4.
ΚΠ
1797 W. Johnston tr. J. Beckmann Hist. Inventions & Discov. I. 201 This substance, which must be mixed with the best frit, is called the precipitate, or gold-calx, of Cassius, gold-purple [Ger. Goldpurpur], or mineral-purple.
1849 J. Weale Rudim. Dict. Terms Archit. ii. 208/1 Gold purple, or Cassius's purple precipitate, the compound oxide which is precipitated upon mixing the solutions of gold and tin.
1992 Stud. Conservation 37 145/1 Gold purple, also known as ‘purple of Cassius’, a precipitate of gold chloride.
extracted from goldn.1adj.
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