The Collaborative International Dictionary of English v.0.48:

Polychroite \Pol"y*chro*ite\, n. [Poly- + Gr. ? color: cf. F.
   polychro["i]te.] (Chem.)
   The coloring matter of saffron; -- formerly so called because
   of the change of color on treatment with certain acids; --
   called also crocin, and safranin.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Crocin \Cro"cin\ (kr?"s?n), n. [Gr. ???? saffron.] (Chem.)
   (a) The coloring matter of Chinese yellow pods, the fruit of
       Gardenia grandiflora. --Watts.
   (b) A red powder (called also polychroite), which is made
       from the saffron (Crocus sativus). See Polychroite.
       [1913 Webster]