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From: Webster's Revised Unabridged Dictionary (1913)

 Cor·al·lin n.  Chem. A yellow coal-tar dyestuff which probably consists chiefly of rosolic acid. See Aurin, and Rosolic acid under Rosolic.
 Red corallin, a red dyestuff which is obtained by treating aurin or rosolic acid with ammonia; -- called also pæonin.
 Yellow corallin. See Aurin.
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