1881 H. Watts VIII. 1637 Chlorophyll..When digested with hydrochloric acid..splits up into phylloxanthin, a brown substance,..and Frémy's phyllocyanic acid, an olive-green substance.
1898 63 390 The chlorophyll derivatives investigated by Tschirch are phyllopurpuric acid (impure phylloporphyrin), phyllocyanic acid (phyllocyanin), and its zinc, copper, and iron compounds.