Abstract
THE phenomenon of the ‘brown stain’ formation on wet cellulosic materials was reported1 in 1934 and has since been studied by Turner2 and his colleagues at Manchester, and by Appel3 and others in the United States, but does not even yet seem widely known. As the effect may be encountered in paper chromatography and with the Weisz4 ‘ring-oven’, it may save trouble to workers in those techniques if attention is directed to it. The effect can readily be seen by putting a strip of filter paper as a wick in distilled water. In a few hours a brown stain is found at the top of the wick, or of its wet portion. The immediate neighbourhood of the stain has a brilliant white fluorescence under ultra-violet light and is strongly dyed by methylene blue (0.1 per cent in water).
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References
Bone, W. H., J. Soc. Dyers and Colourists, 50, 307 (1934).
Turner, H. A., Proc. Paper Makers Assoc., 19, 182 (1938). Bone, W. H., and Turner, H. A., J. Soc. Dyers and Colourists, 66, 315 (1950). Madaras, C. W., and Turner, H. A., ibid., 69, 371 (1953).
Bogaty, H., Campbell, K. S., and Appel, W. D., Textile Res. J., 22, 75 (1952). Schaffer, R., Appel, W. D., and Forziati, F. H., J. Res. Nat. Bur. Stand., 54, 103 (1955).
Weisz, H., Mikrochim. Acta, 140 (1954).
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AMBLER, H., FINNEY, C. Brown Stain formed on Wet Cellulose. Nature 179, 1141 (1957). https://doi.org/10.1038/1791141a0
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DOI: https://doi.org/10.1038/1791141a0
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