The Collaborative International Dictionary of English v.0.48:

Safranin \Saf"ra*nin\, n. (Chem.)
   (a) An orange-red dyestuff extracted from the saffron. [R.]
   (b) A red dyestuff extracted from the safflower, and formerly
       used in dyeing wool, silk, and cotton pink and scarlet;
       -- called also Spanish red, China lake, and
       carthamin.
   (c) An orange-red dyestuff prepared from certain nitro
       compounds of creosol, and used as a substitute for the
       safflower dye.
       [1913 Webster]

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]

WordNet (r) 3.0 (2006):

safranin
    n 1: any of a class of chiefly red organic dyes [syn:
         safranine, safranin, saffranine]