絹の堅牢な黒染

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タイトル別名
  • Fast black dyeing of silk.
  • キヌ ノ ケンロウ ナ クロゾメ

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For performing the fast blask dyeing of silk, new dyes were synthesized and the effective dyeing methods were developed. The dyeings were evaluated by the results of washing fastness test and colour depth (=log(100/Y); Y, stimulus value corresponding to lightness). The silk samples were dyed by the dyes including anthratheneor 1, 2-benzocarbazole nuclei. The complexation of these dyes with chromium or cobalt improved the dyeability and washing fastness of the dyed silk. The dyes synthesized by coupling Diazo Black Salt K with H acid, S acid or chromotropic acid were inferior to the direct dye-Deep Black EX-in washing fastness. But washing fastness was improved by the after treatment with tannic acid and ferric ion in case of the dye composed one chromotropic acid molecule and two Diazo Black Salt K molecules. The oxidation of silk which adsorbed p-phenylenediamine and aniline hydrochloride gave the very black dyeing. This dyeing did not give satisfactory washing fastness, but it was improved by bottoming with reactive dye or a little addition of a reactive dye into the impregnating bath.

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