Fig. 1From: The influence of commercial primed canvases in the manifestation of metal soaps protrusions in Georgia O’Keeffe’s oil paintingsa Pedernal (1941), oil on canvas, b Detail of the metal soap protrusions in Pedernal (1941), c Calla Lily on Red (1928) and d) detail of Calla Lily on Red (1928) with new protrusions growing under re-painted areas (indicated by arrows), Georgia O’Keeffe Museum, Santa FeBack to article page