A varnish is a solution of resins or drying oils forming a transparent, hard, shiny surface on drying. Spirit varnishes use alcohol and other volatile liquids as the solvent, oil varnishes one of the drying oils, eg linseed oil, poppyseed, etc, usually diluted with oil of turpentine Resins dissolved in turpentine alone are often known as crystal varnishes. The usual resins are shellac, mastic, sandarac, etc, for spirit varnishes ; and amber, copal, kauri, etc., for oil varnishes. Lacquers are natural varnishes. Research Varnish
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Research Varnish