"These are happening on works of art throughout the generations " since oil paint was created," says a Smithsonian conservator. They've appeared on paintings ranging from Rembrandt to van Gogh to Chagall to O'Keeffe. Turns out they're made of soap " and no, that's not because anyone has tried to wash the canvases. " Smithsonian […]
SOURCE: ArtsJournal at 11:04AM on February 26, 2019