The use of coal tar colors in food products (1904)
Lieber, Hugo. [from old catalog] · New York, H. Leieber & co · leaf 148
dis- like the color at all, but was always ready to receive the color without any attempt to avoid same. The appetite remained about uniformly good. The dog drank much milk and at the end of the test was in excellent condition. The weight taken daily showed a steady increase of from 2 to 6 gr.… … SO,Na Sodium salt of diathyl-dibenzyldiamidotriphenylcar- binoltrisulpho acid. *G. Schultz & p. Julius Tabellarische Uebersicht.
Coal-tar colors, Physiological effect of · Food adulteration
Internet Archive · The Library of Congress · Public domain (published before 1931). Free to use for anything.