Fig. 8From: The influence of light and relative humidity on the formation of epsomite in cadmium yellow and French ultramarine modern oil paintsSEM and EDX imaging of W&N French ultramarine paint aged at 75% RH, in elevated light conditions: a SE image on oil-primed canvas; b SE image on acrylic-primed canvas; c SE image of crystal on surface on acrylic-primed surface; d–g false-coloured EDX elemental maps of image c whereby green is O, cyan is S, blue is Mg, and magenta is NaBack to article page