The Collaborative International Dictionary of English v.0.48:

Corallin \Cor"al*lin\, n. [So named in allusion to the color of
   red corallin, fr. L. corallum coral.] (Chem.)
   A yellow coal-tar dyestuff which probably consists chiefly of
   rosolic acid. See Aurin, and Rosolic acid under
   Rosolic.
   [1913 Webster]

   Red corallin, a red dyestuff which is obtained by treating
      aurin or rosolic acid with ammonia; -- called also
      p[ae]onin.

   Yellow corallin. See Aurin.
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Aurin \Au"rin\ ([add]"r[i^]n), n. [L. aurum gold.] (Chem.)
   A red coloring matter derived from phenol; -- called also, in
   commerce, yellow corallin.
   [1913 Webster]