| orcein | <chemistry> A reddish brown amorphous dyestuff, obtained from orcin, and forming the essential colouring matter of cudbear and archil. It is closely related to litmus. Source: Websters Dictionary (01 Mar 1998) |
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| aceto-orcein stain | <technique> A stain used for chromosomes in air-dried or squashed cytologic material. (05 Mar 2000) |
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| orcein |
a brown coloring matter, derived from orcinol and soluble in alcohol; used as a specific stain for elastic tissue.
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