Influence of metallic salts on color and color fastnesses of tanned silk

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  • タンニン酸吸着絹の色相および染色堅ろう度に及ぼす金属塩の影響
  • タンニンサン キュウチャク キヌ ノ シキソウ オヨビ センショク ケンロウド
  • 絹の金属媒染に関する研究 V

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Abstract

The tanned silk habutae was treated with several metallic salts, then the influence of each metallic ion was investigated on the color changes and color fastnesses to light, washing and hot water. The magnitude of color change by mtallic ion was found to be in the following order; Fe(II)>Cr(VI)>Cu(II)>>Cr(III)≥Co(II). In order to obtain the black shade due to tannin-iron compound, the amounts of Fe(II) uptaken by post-treatment must be more than 4.5 times those of the tannic acid in molar ratio. Although the color fastness to washing and hot water of the tanned silk habutae was satisfactory, the light fastness was of the lowest grade. The light fastness could be increased by post-treatment with the metallic salts. The alteration by washing test of the tanned silk habutae was recognized when treated with Cr-alum, Iron(II) sulfate, and Cobalt (II) nitrate, but not by Iron (II) sulfate treatment. The alteration by hot water test was smaller. The staining to undyed cloths (silk and cotton) during washing and hot water tests was hardly recognized.

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