Valubale Receipts. Varnish for French Patent Black Leather.

The Scientific American 7, 16.8.1862

One gallon of linseed oil; 1 pound of white lead and 1 pound of litharge are boiled in an iron vessel until the mass becomes ropy when lifted upon a statula. This varnish is then applied to the leather in four thin coats, each allowed to dry before the other is put on. another coat is now put on with boiled oil and litharge, in the same proportion, thinned with a little turpentine and lampblack added. When dry, the finishing coat is composed of 10 pounds of the above boiled oil, to which is added 3 pounds of copal varnish, and the whole thinned with turpentine.