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348 JOURNAL OF THE SOCIETY OF COSMETIC CHEMISTS (39) Piattelli, M., et al., The structure of melanins anti melanogenesis. II. Sepiomelanin and synthetic pigments, Tetrahedron, 18, 941-9 (1962). (40) Piattelli, M., et al., The structure of melanins and melanogenesis. III. The structure of sepiomelanin, Ibid., 19, 2061-72 (1963). (41) Bollert, V., and Eckert, L., Quantitative verfolgung des Blondie•vorgangs von Human- haar, J. Soc. Cosmet. Chem., 19, 275-88 (1968). (42) Flesch, P., The red pigmentary system and its relation to black melanogenesis, Ibid., 21, 77-83 (1970).