Prizes next Week

1854 Scientific American  
Having received a number of letters re cently, inquiring how to make different kinds of varnishes, we present the following, to save time in replying to each separately. Different substan ces are employed for making varnish, the object being to produce a liquid easily applied to the surface of cloth, paper, or metal, which, when dry, will pro tect it with a fine skin. Gums and resins are the substances employed for making varnish; they are dissolved either in turpentine, alco hol, or oil, in a
more » ... hol, or oil, in a close stone-ware, glass, or metal vessel, exposed to a low heat, as the case m�y require, or cold. The alcohol or turpentine dissolves the gum or resin, and holds them in solution, and after the applica tion of the varnish-this mixture lJeing me chanical-the moisture of the liquid evapor ates, and the gum adheres to the article to which it is applied. WIiITl!l SPIRIT V AKNIsli-Sandarach, 250 parts; mastic in tears, 61 ; elemi resin, 32 ; turpentine Gi; alcohol, of 85 per cent., 1000 parts; by measure. The turpentine is to be added after the res ins are dissolved. This is a brilliant varnish, but not so hard as to bear polishing.
doi:10.1038/scientificamerican12301854-128g fatcat:qmp5osvou5gvhke3ujgkriagka