Orcein
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A reddish brown amorphous dyestuff, /, obtained from orcin,
and forming the essential coloring matter of cudbear and archil. It is
closely related to litmus.Orcein meaning & definition 1 of Orcein.
A reddish brown amorphous dyestuff, /, obtained from orcin,
and forming the essential coloring matter of cudbear and archil. It is
closely related to litmus.