A bluish violet, crystalline substance obtained in the purification of crude wood vinegar. It is regarded as a complex quinone derivat…
Its definition shares important concepts with this word: dyestuff, substitute, cochineal, archil, consists.
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Roccellin
A red dyestuff, used as a substitute for cochineal, archil, etc. It consists of the sodium salt of a complex azo derivative of naphtol.
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