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Table 1 Ageing conditions of paint samples. CY = cadmium yellow, FU = French Ultramarine

From: The influence of light and relative humidity on the formation of epsomite in cadmium yellow and French ultramarine modern oil paints

Paint Substrates Ageing conditions
Relative humidity (%) Light conditions
CY Oil-primed canvas and acrylic-primed canvas ~ 50 Ambient light
~ 50 Dark
75 Elevated light (high lux)
75 Near-dark (low lux)
FU Oil-primed canvas and acrylic-primed canvas ~ 50 Ambient light
~ 50 Dark
75 Elevated light (high lux)
75 Near-dark (low lux)