01 n. A dyestuff extracted from certain lichens (Roccella tinctoria, Lecanora tartarea, etc.), as a blue amorphous mass which consists of a compo…
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1.
A dyestuff extracted from certain lichens (Roccella tinctoria, Lecanora tartarea, etc.), as a blue amorphous mass which consists of a compound of the alkaline carbonates with certain coloring matters related to orcin and orcein.(Chem.)
Phrases & compounds
Litmus paper —
unsized paper saturated with blue or red litmus, -- used in testing for acids or alkalies.