Cobalt violet light
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.
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