Fig. 4From: The influence of commercial primed canvases in the manifestation of metal soaps protrusions in Georgia O’Keeffe’s oil paintingsDarkfield optical images and BSE images of: Pedernal (a, b) and A Man from the Desert (c, d). Samples layer composition: ground layer (1), preparation layer (2) and visible layer (3). Lead-based white pigment agglomerates are indicated with an asteriskBack to article page