Table 1 Oil paints layers investigated in this study. Pigment and extender composition taken from supplier information and5.

From: On the influence of relative humidity on the oxidation and hydrolysis of fresh and aged oil paints

Trademark and paint type

Talens (TA) “Rembrandt Artists’ Quality”

Old Holland (OH) “Classic Oil Colour”

Winsor&Newton (WN) “Artists’ Oil Colour”

Pigment and extenders/additives composition

Cadmium Zinc Sulfide (PY35); aluminium stearate extender

Cadmium Sulfide; alumina pigment extender or coating; hydrogenated castor oil

Cadmium Zinc Sulfide (PY35), MgCO3, BaSO4; aluminium containing extender

Year of preparation and treatment:

2006: Artificial ageing at high (75%) and low (6%) RH%, in the dark at 70 °C, 12 weeks

2016: Curing at high (75%) and low (6%) RH%, ambient light and temperature, 9 weeks