Yellowing

This effect on oil paintings is usually caused by one of three reasons: excessive use of a 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. Source: Ralph Mayer, "A Dictionary of Art Terms and Techniques"<br><br>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.<br><br>In painting, a tendency on the part of binding media to turn a tint towards yellow. This is most likely to occur when linseed oil is included.