The project consumed quantities of mercury, golden litharge, and tin. It was made by mixing natural form of lead(II) oxide called litharge and vinegar. The driers used for varnish are generally acetate of lead or litharge. This includes large amounts of slag pieces, litharge cakes, and crucibles and moulds. It is associated with cerussite, galena, litharge, massicot, mimetite, native lead, and wulfenite. Litharge, an oxide of lead, is in most general use. Historically, the term "litharge" has been combined to refer to other similar substances. The remaining TBRC is used to treat litharge slag to recover the lead for sale. Litharge is the most commonly used inorganic compound of lead. Litharge is a secondary mineral which forms from the oxidation of galena ores.