cobalt violet

noun

1

: any of several purple pigments containing a compound of cobalt (as cobalt phosphate)

2

: a moderate purple that is redder and duller than heliotrope (see heliotrope sense 4a), redder, lighter, and stronger than average amethyst, redder and less strong than manganese violet, redder and deeper than average lilac (see lilac sense 3a), and redder and stronger than mignon

called also thistle

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