Diagram, absorption spectra by [Henry] Edward Schunck An absorption spectra in black ink with spectra labelled 1-11, showing: (1) the product of the action of melting caustic potash on phyllocyanin dissolved in alcohol; (2) the same dissolved in ether; (3) the same dissolved in concentrated hydrochloric acid; (4) phyllocyanin in ether; (5) phylloxanthin in ether; (6) the product of the action of alkali on phylloxanthin in ether; (7) the same, dilute solution; (8) the same dissolved in acetic acid; (9) alkachlorophyll in ether; (10) the product of the action of sulphuric acid on alkachlorophyll in ether; and (11) the product of the action of acetic acid on alkachlorophyll in ether. Subject: Chemistry / Biology This diagram was published in volume 50 of the Proceedings of the Royal Society alongside the paper 'Contributions to the chemistry of chlorophyll'. 1891