Fay, Irving Wetherbee, 1861- · New York D. Van Nostrand · leaf 262
opment of color in all the various phthaleins to be described. As the substance itself has no color at all and only develops its characteristic red color on adding an alkali to form a salt, and as the lactone ring is now regarded as broken when the salt of the substance is formed, the ring… … NaO ./" Phenolphthalein. Colorless ^{/^^ + 2H2O — CO.ONa Sodium phenolphthalein. Red
Coal-tar colors
Internet Archive · Robarts - University of Toronto · Public domain (published before 1931). Free to use for anything.
