artnet | Sarah Cascone:
A team of researchers are working to find a solution to an unlikely scourge that is marring the surfaces of canvases around the world: soap. Conservation scientists say that tiny formations of lead-based soaps—each about a tenth of a millimeter in diameter—are threatening to mar paintings by artists ranging from Rembrandt van Rijn to Georgia O’Keeffe. A team of experts has spent years researching why these microscopic white pockmarks appear—but they can’t figure out how to stop them…read more
Image |Courtesy of the Metropolitan Museum of Art | Francesco Granacci, The Birth of Saint John the Baptist (circa 1506–07) | The cross-section of a paint sample removed from the grass area, in lower right border, was found to contain lead soaps protruding through the paint surface that give rise to the granular to surface texture of the paint.