Pigments, Paint and Painting: A practical book for practical men

by George Terry

It generally consists simply of barytes, or gypsum, or china clay, coloured by a small percentage of Prussian blue, with or without the addition of a lesser proportion of ultramarine. The barytes or other base is very thoroughly agitated in water, while a solution of green copperas and a solution of yellow prussiate are gradually added without ceasing the agitation. When the incorporation of the ingredients has been completely accomplished, the precipitate is settled, washed, filtered, and dried. Following are a few recipes:—

Pale. (1) 1 cwt. barytes, 1 lb. green copperas, 1 lb. yellow prussiate.

Pale. (2) 1 cwt. china clay, 2 lb. green copperas, 2 lb. yellow prussiate.

Pale. (3) 1 cwt. gypsum, 1½ lb. green copperas, 1½ lb. yellow prussiate.

Medium. (1) 1 cwt. barytes, 3 lb. green copperas, 3 lb. yellow prussiate.

Medium. (2) 1 cwt. china clay, 6 lb. green copperas, 6 lb. yellow prussiate.

Medium. (3) 1 cwt. gypsum, 4½ lb. green copperas, 4½ lb. yellow prussiate.

Deep. (1) 1 cwt. barytes, 5 lb. green copperas, 5 lb. yellow prussiate.

Deep. (2) 1 cwt. china clay, 10 lb. green copperas, 10 lb. yellow prussiate.

Deep. (3) 1 cwt. gypsum, 7½ lb. green copperas, 7½ lb. yellow prussiate.