The Collaborative International Dictionary of English v.0.48:

Verditer \Ver"di*ter\, n. [F. vert-de-terre, literally, green of
   earth.] (Chem.)
   (a) Verdigris. [Obs.]
   (b) Either one of two pigments (called blue verditer, and
       green verditer) which are made by treating copper
       nitrate with calcium carbonate (in the form of lime,
       whiting, chalk, etc.) They consist of hydrated copper
       carbonates analogous to the minerals azurite and
       malachite.
       [1913 Webster]

   Verditer blue, a pale greenish blue color, like that of the
      pigment verditer.
      [1913 Webster]