| crottle | Purple-red colouring agent derived from the lichen Ochrolechia tartarea (family Lecanoraceae) and for the colouring principles from Roccellaceae used for colouring liquid pharmaceutical preparations. Synonym: crottle. (05 Mar 2000) |
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| crottle | any of several lichens of the genus Parmelia from which reddish brown or purple dyes are made |
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