Yellowing: Development of a yellow cast in aging
paint; most noticeable in the dried films of white paints
or clear varnishes.
Oxidation of alkyd or oil-based paint or varnish.
Heat from stoves, radiators and heating ducts.
Lack of light (e.g., behind pictures or appliances, inside
Top quality latex paints do not tend to yellow, nor does
non-yellowing varnish. Alkyd paints, because of their
curing mechanism, do tend to yellow, particularly in areas
that are protected from sunlight.