Varnish is a transparent, hard, protective finish or film that is primarily used in wood finishing and a lot of other materials like paper. Varnish is traditionally a combination of a drying oil, a resin, and a thinner or solvent. Varnish finishes are usually glossy but may be designed to produce satin or semi-gloss sheens by the addition of "flatting" agents. Varnish has little or no color, is transparent, and has no added pigment. Varnishes are also applied as a final step to achieve a film for gloss and protection. Some products are marketed as a combined stain and varnish.