In the manufacture of gold paint pale copal varnish, thinned with turpentine, is often used. Some gold paints are made with a white spirit varnish; others are mixed with a medium prepared by dissolving collodion cotton in amyl acetate and diluting with petroleum ether. When the bronze powder has to be mixed with the medium, pale copal varnish, thinned with turpentine, is very often employed.