"1. WATER-PROOF GILDING AND SILVERING.-This kind of gilding, usually termed oil gilding, being the cheapest and most durable, is in general use for gilding or silvering letters on signs, labels. and may be performed as follows: -Grind one ounce of white lead and two ounces of litharge, very fine, in a gill of old linseed oil, and if convenient, add nearly one-fourth of a gill of old copal varnish, and half an ounce of stone yellow; but neither of these last, are very essential ingredients. Expose this composition to the rays of the sun for a week or more in a broad open vessel, observing, however, to keep it free from dust."