Fig. 6
From: Artificial orpiment, a new pigment in Rembrandt’s palette
Rembrandt (workshop?), Man in a Red Cap, c. 1660, oil on canvas (lined), 80 × 102 cm, Museum Boijmans van Beuningen, Rotterdam. Visible light image showing the sample location X (a), and light microscopic image of paint cross-section from the left sleeve (as seen from the front) (X) showing the presence of spherical particles of orpiment in the lower, yellowish brown paint layer (1), mixed with (discolored) smalt, lead–tin yellow and yellow earth (b)