Argent.
—A reddish gray tint, which can be produced by mixing together nine parts of black, sixteen of white, one of red and just a little orange.
Ash Gray.
—Lamp black and a little French ochre added to white lead give this colour. Another mixture is as follows: two parts of burnt sienna, three parts of light ultramarine blue, sixty parts of zinc white.
Black Slate.
—Mix together black and Prussian blue in the proportion of about thirteen parts of the former to one of the latter and add a little white.
Dark Gray.
—There is no exact point where this colour is produced by an admixture of black and white and a little orange or red. Mix eight parts of black, one of white and a touch of red to produce this shade.
Dark Lead.
—This is a dark grey, being produced simply by adding lamp black to white lead.