Definitionn. a purplish dye obtained from orchil lichens
Last update: September 20, 2015
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- Of these the most important are such as yield, by maceration in ammonia, the dyes known in commerce as archil, cudbear and litmus. [Please select]
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The lichens thus treated acquire gradually a deep purple colour, and form the products called "cudbear." [Please select]
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Orchil paste, orchil extract, and cudbear are obtained by exposing the plants (species of lichens) containing the colouring principle, called _Orcin_, itself a colourless substance, to the joint action of ammonia and air, when the oxygen of the air changes that orcin by oxidising it into _Orcèin_, which is the true red colouring matter contained in the preparations named. [Please select]
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