
1) Triarylmethane dye
Found on
https://www.crosswordclues.com/clue/aurin

Aurin (C.I. 43800), sometimes named rosolic acid or corallin is an organic compound, forming yellowish or deep-red crystals with greenish metallic luster. It is practically insoluble in water, freely soluble in alcohol. It is soluble in strong acids to form yellow solution, or in aqueous alkalis to form carmine red solutions. {pH_indicator|indicat...
Found on
http://en.wikipedia.org/wiki/Aurin

• (n.) A red coloring matter derived from phenol; -- called also, in commerce, yellow corallin.
Found on
http://thinkexist.com/dictionary/meaning/aurin/
Au'rin (a'rĭn)
noun [ Latin
aurum gold.]
(Chemistry) A red coloring matter derived from phenol; -- called also, in commerce,
yellow corallin .
Found on
http://www.encyclo.co.uk/webster/A/147

Type: Term Pronunciation: aw′rin Definitions: 1. A triphenylmethane derivative used as an indicator (changes from yellow to red at pH 6.8-8.2) and as a dye intermediate; also used to help differentiate tubercle bacilli from other acid-fast microorganisms. Synonyms: corallin, p-rosolic acid
Found on
http://www.medilexicon.com/medicaldictionary.php?t=8648
No exact match found.