螢光漂白劑の研究第1報 : 染着性の定量的測定法について

概要

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Instead of their remarkable progress in practical use, the optical whitening agents have many uncultivated problems owing to their speciality that they have no apparent colour but reveal their effects only by the excitation of the ultra-violet rays contained in sun-beams. On the way of our efforts, elucidating the dyeing properties of some fluorescent dyes, chiefly the substantive cotton dyes of stilben series, we have found some fundamental phenomena concerning the relationship between the intensity of fluorescence and the quantity of dyestuff dyed on the cotton fiber. Our chief results may be summerized as follows. 1) Fluorescence of the optical whitening agent on fibers as well as in solution, decreases its intensity as the concentration increases over a certain limit : so-called concentration quenching. 2) Quantitative relationship between the quantity of dyestuff on fiber and the intensity of fluorescence has been determined. 3) The difficulty of determining the apparent brightness of the dyed fibers was discussed. 4) Sensitizing effects of fluorescence by some neutral salts and soaps, are observed and this preliminary report is presented.