Once you start painting and closely looking at colors, you soon realize that simply reaching for a tube of black paint whenever you need to put in a shadow doesn’t work. The result isn’t subtle enough to capture a realistic shadow. The Impressionist Renoir is quoted as saying “No shadow is black. It always has a color. Nature knows only colors … white and black are not colors.”So if black was to be banished from their palettes, what did the Impressionists use for shadows?