Anime eight pouuds; clarified linseed oil three gallons; litharge one-fourth pound; acetate of lead one-half pound; sulphate of copper one-fourth pound.

All these materials must be carefully but thoroughly boiled together until the mixture becomes quite stringy, and then five and a half gallons of heated turpentine stirred in. It can be easily deepened in color by the addition of a little gold-size.