is the phard, varnish-like coating formed from oil
oxidation products, that bakes on to pistons
during high-temperature operation of automotive engines and industrial
machinery. Varnish can accelerate cylinder wear. Varnish formation can be
reduced with the use of a
detergent-dispersant and an oxidation
inhibitor in the oil. See engine deposits.
2) In ink formation, varnish — composed of resin,
solvent, and additives
— is the vehicle to which pigment is added to make
printing ink.
Application
Notes:
