A dye composition for hair dyeing containing an azo dye as a main component was found to indicate negative in the Ames test by specifying impurities that indicate positive in the Ames test among impurities in the azo dye contained in the dye composition for hair dyeing containing the azo dye as a main component, by analyzing purification methods for the purpose of removing the impurities, and by carrying out purification by a specific method in order to develop a purification method for the dye composition for hair dyeing containing the azo dye as a main component and proving negative in the Ames test and to provide the dye composition for hair dyeing that is produced by applying the purification method and indicates negative in the Ames test.
通过在含有偶氮
染料作为主要成分的染发用
染料组合物中所含偶氮
染料的杂质中指明在艾姆斯试验中呈阳性的杂质,通过分析去除杂质的纯化方法,发现含有偶氮
染料作为主要成分的染发用
染料组合物在艾姆斯试验中呈阴性、并通过特定方法进行纯化,以开发出一种用于含有偶氮
染料作为主要成分的染发用
染料组合物的纯化方法,并证明该组合物在阿姆斯试验中呈阴性,同时提供应用该纯化方法生产的染发用
染料组合物,该组合物在阿姆斯试验中呈阴性。