<研究報告>スオウ染めに関する基礎的研究(II) : 紫色染めにおける媒染浴のpHおよび濃度と色調の経時的変化との関係

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The results obtained through experiments are as follows. (1) In the case of colouring Brasilin with metal salts, the following results were obtained; if the pH of mordant bath is low, it takes much time to colour, but generally the lower the pH is, the stabler its colour is within the range of pH grade which is necessary one for colouring. In the case of silk-dyeing, the same results were attained, however, the influence of pH on the silk-dyeing is not so remarkable as on the solution. (2) In the case of purple-dyeing by mordanting with Fe, it is necessary for producing the pure purple to raise the pH grade of mordant bath more than 11. In the concentration of the mordant bath 1 × 10^3 mol is suitable for the silk-dyeing by mordanting with Fe^<++>, and 1 × 10^2 mol, with Fe^<+++> (the concentration of Brasilin is about 0.1%). (3) It is necessary for comparatively fast purple-dyeing to lower the pH grade of mordant bath, however, in the practical dyeing the following conditions are proper; a mordant is Fe^<++> salt, the concentration of bath 1 × 10^3 mol, the pH 11, in due consideration of the influence of pH on colouring and light resistance of dyeing material (the concentration of Brasilin is about 0.1%).
1967-11-25