For Yellowing we have terms and definitions in 2 topics. The topics are Paper and Sculptural.

Describes a transformation inherent to all vegetable fibers which is caused by aging. Paper made of vegetable fibers will turn various degrees of yellow as its environment couples with aging to produce this phenomenon. Yellowing is very evident in groundwood papers and only a few hours in direct sunlight is enough to yellow newspaper.
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This effect on oil paintings is usually caused by one of three reasons: excessive use of linseed oil medium; applying any of the varnishes that are prone to yellow with age; or most often an accumulation of dirt embedded into the varnish.
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