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Varnish is a transparent coating type of paint with a solvent. It is a combination of a drying oil, a resin and a thinner or solvent, and is employed for protection against deterioration and corrosion.Solvent evaporates and leave a hard, transparent, glossy film.
Varnish may Generally be of Three Types:
a) Lacquers –Those which usually form films on evaporation of solvents.
b) Air-drying varnishes – Those which usually form films by oxidation, polymerization or by any other chemical reaction at room temperature.
c) Staving varnishes – Those which form films by chemical reaction on application of heat at specified time and temperature.