varnish
nounA thick, viscid, glossy liquid, laid on work by painters and others, to give it a smooth hard surface and a beautiful gloss. Varnishes are made of different materials and for different purposes. amber varnish is made of amber, lintseed oil, litharge and turpentine. Black varnish, for japanning wood and leather, is made by mixing lampblack with a proper quantity of a strong solution of gum-lac in spirit of wine.