1) Food coloring 2) Natural dye
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https://www.crosswordclues.com/clue/orcein
Orcein, also archil, orchil, lacmus and C.I. Natural Red 28, are names for dyes extracted from several species of lichen, commonly known as `orchella weeds`, found in various parts of the world. A major source is the archil lichen, Roccella tinctoria. Orcinol is extracted from such lichens. It is then converted to orcein by ammonia and air. In t.....
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http://en.wikipedia.org/wiki/Orcein
• (n.) A reddish brown amorphous dyestuff, /, obtained from orcin, and forming the essential coloring matter of cudbear and archil. It is closely related to litmus.
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http://thinkexist.com/dictionary/meaning/orcein/
(or-se´in) a brownish-red coloring substance obtained from orcinol; used as a stain for elastic tissue.
Found on
http://www.encyclo.co.uk/local/21001
Or'ce·in noun (Chemistry) A reddish brown amorphous dyestuff, ..., obtained from orcin, and forming the essential coloring matter of cudbear and archil. It is closely related to litmus.
Found on
http://www.encyclo.co.uk/webster/O/29
Type: Term Pronunciation: ōr′sē-in Definitions: 1. A natural dye derived from orcinol by treatment with air and ammonia; as a purple dye complex it is used in various histologic staining methods.
Found on
http://www.medilexicon.com/medicaldictionary.php?t=63135
a red dye, the principal coloring matter of cudbear and orchil, obtained by oxidizing an ammoniacal solution of orcinol.
Found on
https://www.infoplease.com/dictionary/orcein
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