Pigment Timeline: Excellent resource showing when pigments came into use
Philip Ball on the Chemistry of Pigments: Lecture from Philip Ball (use of his visuals is not great)
A Wall of Color, A Window to the Past: article about Harvard’s Art Galleries pigment collection
Pissarro’s Artist’s Palette with a Landscape
CAMEO: Database of art materials at the Museum of Fine Arts Boston
PhET Simulation of the Bending of Light
Paintings by pigments: database of paintings for which pigment information is known