Cooked oil varnish

Description

A varnish prepared by dissolving a Natural resin, such as Copal, in a hot Drying oil. Cooked oil varnishes may also contain metallic driers and volatile solvents. When dried, cooked oil varnishes form a tough, insoluble film. Oil varnishes dry by polymerization producing a tough, insoluble film. They have a dark initial color that darkens more with age. When used on oil paintings, they may cause cracking and wrinkling of the paint layers.

Synonyms and Related Terms

hard oil varnish; barniz de aceite cocido (Esp.)

Authority

• Reed Kay, The Painter's Guide To Studio Methods and Materials, Prentice-Hall, Inc., Englewood Cliffs, NJ, 1983