Fig. 2From: The influence of light and relative humidity on the formation of epsomite in cadmium yellow and French ultramarine modern oil paintsNormalised ATR-FTIR spectra for W&N cadmium yellow paint samples on oil-primed substrate after ageing conditions a 50% RH in ambient light conditions; b 75% RH in elevated light conditions; c 75% RH in near-dark conditionsBack to article page