What is a Varnish?
Varnish is a type of transparent or translucent protective coating that is applied to surfaces to enhance their appearance, provide a glossy or satin finish, and protect them from wear, moisture, and other environmental factors. It is commonly used on wood, but can also be applied to various other materials such as metal, plastic, and stone.
The main purpose of varnish is to create a durable and protective layer that enhances the natural beauty of the underlying material. It forms a hard, transparent film that adds depth, richness, and a smooth finish to the surface. Varnish can be clear or tinted with pigments to add color and alter the appearance of the surface. 
Varnish is typically composed of a resin, a solvent, and various additives. The resin forms the film when the solvent evaporates, creating a protective layer. Different types of resins can be used in varnishes, including natural resins like linseed or tung oil, as well as synthetic resins like polyurethane or alkyd.
