Development of a yellow cast in aging paint; most noticeable in the dried films of white paints or clear varnishes.
Normal oxidation of oil-based paint or varnish
Exposure to heat from stoves, radiators and heating ducts
Exposure of oil-based paints to household cleaners that contain ammonia
Lack of light (e.g., behind pictures or appliances, inside closets, etc.)
Use a high-quality latex paint, which does not tend to yellow. Oil-based paints have a tendency to yellow, particularly in areas that are protected from sunlight and/or exposed to ammoniated cleaning products.