chromogen

from WordNet (r) 3.0 (2006)

chromogen
    n 1: a compound that can be converted to a pigment

from The Collaborative International Dictionary of English v.0.48

Chromogen \Chro"mo*gen\, [Gr. ? color + -gen.]
   [1913 Webster]
   1. (Biol.) Vegetable coloring matter other than green;
      chromule.
      [1913 Webster]

   2. (Chem.) Any colored compound, supposed to contain one or
      more chromophores.
      [1913 Webster]