Direct Deep Black

Japanese: ダイレクトディープブラック(英語表記)direct deep black
Direct Deep Black
It is a direct black dye for cotton that was once used in large quantities, but production has been discontinued due to the emergence of reactive dyes and the carcinogenicity of the intermediate benzidine, making it a historically prominent dye. The raw materials are benzidine, m -phenylenediamine, H-acid, and aniline, and it can dye cellulose fibers black in one bath rather than a neutral bath. Its fastness is somewhat low, with light fastness of Class 3 and washing fastness of Class 2 (dye fastness). There is an alternative product synthesized using dianisidine (3,3'-dimethoxybenzidine), which is less carcinogenic.

Source: Heibonsha World Encyclopedia, 2nd Edition Information

Japanese:
木綿用の黒色直接染料で,かつては大量に使用されたが,現在では反応染料の出現と中間体であるベンジジンの発癌性のために製造が中止され,歴史的に著名な染料となった。原料はベンジジン,m‐フェニレンジアミン,H酸およびアニリンで,中性浴よりセルロース繊維を1浴で黒色に染めることができる。堅牢度はやや低く,耐光堅牢度3級,洗濯堅牢度2級程度である(染色堅牢度)。発癌性の低いジアニシジン(3,3’‐ジメトキシベンジジン)を用いて合成した代替品がある。

出典 株式会社平凡社世界大百科事典 第2版について 情報

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