Spectrum analysis : six lectures delivered in 1868 before the Society of Apothecaries of London (1885)
Roscoe, Henry E. (Henry Enfield), 1833-1915, Schuster, Arthur, Sir, 1851-1934 · London : Macmillan and Co. · leaf 218
LECT. IV.] ABSORPTION SPECTRA. 191 erbium chloride; No. 6, that of one of uranium nitrate, and No. 7, that given by glass coloured blue by oxide of cobalt. Fig. 60 exhibits the absorption spectra of the very interesting colouring matters contained in the madder root (Kubia tinctorum), … but now artificially prepared from coal-tar, and known as the alizarine colours. The selective absorption exerted by the artificial colouring matter is precisely the same as that observed in the case of the natural madder dye, and hence the perfect
Spectrum analysis
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