Solochrome cyanine R from eight sources has been subjected to paper, thin-layer and column chromatography. However, a chemical method of isolating the major active constituent of the dye has proved much more convenient and satisfactory. A procedure is described whereby a product with consistent composition can be obtained from almost any commercial sample of the dye.
E. J. Dixon, L. M. Grisley and R. Sawyer, Analyst, 1970, 95, 945 DOI: 10.1039/AN9709500945
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