Mosaic gold, or stannic sulfide, SnS2, is obtained as a yellow scaly crystalline powder, and used as a pigment in bronzing and gilding wood and metal work. It was called by the alchemists aurum musivum, or aurum mosaicum. It is also called bronze powder. Alchemists prepared this by combining mercury, tin, sal ammoniac, and flowers of sulfur, grinding, mixing, then setting them for three hours in a sand heat. The dirty sublimate being taken off, aurum mosaicum was found at the bottom of the matrass.