View source for File:Covioletd C100x.jpg

Cobalt violet dark

Normal (left) and UV (right) reflected light images at 100x of pigment/collodion mixture on glass slide to illustrate pigment color along with presence or absence of autofluorescence.  Normal light = Halogen lamp (100 W, no filter); UV light=Mercury gas discharge lamp (100W, excitation filter=340-380nm, suppression filter=425 nm).  Image credit=Scientific Research lab, Museum of Fine Arts, Boston.