1. Gettens, R.J. and Stout, C.L.Painting Meterials, Van Nostrand, New York, 1952, p. 42. Mayer, Ralph,The Artist’s Handbook, Viking Press, New York, 1970, p. 175.
2. Levison, H.W.Artists’ Pigments, Hallandale, FL, 1976, p. 31.
3. Color stability of artists' vehicles