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Titanium Green

has been proposed as a substitute for the green arsenical pigments in
common use; but, apart from its expense, the colour is very inferior to
Scheele's green, &c. Titanium green is a ferrocyanide of that metal,
produced by adding yellow prussiate of potash to a solution of titanic
acid in dilute hydrochloric acid, and heating the mixture to ebullition
rapidly. The dark green precipitate is washed with water acidulated with
hydrochloric acid, and dried with great care, since it decomposes at
temperatures above 100 deg..

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