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From: Webster's Revised Unabridged Dictionary (1913)

 Ver·di·ter n.  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.
 Verditer blue, a pale greenish blue color, like that of the pigment verditer.