The regulation stipulates the method of test for 29 aromatic amines in hair dyes, including 4,4'-Bi-o-toluidine, 3,3'-Dichlorobenzidine, 3,3'-Dimethoxybenzidine, 4,4'-Methylenedianiline, 4,4'-Methylenedi-o-toluidine, 4,4'-Methylene-bis(2-chloroaniline), 4,4'-Oxydianiline, 4,4'-Thiodianiline, o-Anisidine, 4-Aminoazobenzene, etc.