yellowing

Discolouration that affects the whole surface of an item – e.g. an entire sheet of newspaper or the entire varnish layer of a painting - and that has a yellow tinge.

 

This postcard has become yellowed overall. Photo courtesy of Alice Cannon. 

A glaze applied by the artist to prevent smudging of the drawing has yellowed with time. Photo courtesy of the State Library of Victoria. 

Treatment to remove discoloured varnish reveals the extent of yellowing that has taken place. Photo courtesy of Tony Rich, Art Conservation Framers.