arbstoffen

1 - Amino - 4 - arylaminoanthraquinone - 2-sulphonic acids or their salts are chlorinated or brominated, preferably in presence of a halogenation catalyst, in aqueous suspension or in sulphuric acid solution. Mono- and di-halogen derivatives may be obtained, and the products dye wool blue shades. In examples, sodium 1-amino-4-p-acetylaminoanilidoanthraquinone-2-sulphonate is (1) monochlorinated by passing gaseous chlorine into its sulphuric acid solution containing iodine; (2) monobrominated similarly; (3) dibrominated. Also, sodium 1-amino-4-p-(methylacetylamino)anilidoanthraquinone-2-sulphonate is treated as in (1), (2) and (3) above, 1-amino-4-anilinoanthraquinone-2-sulphonic acid and its sodium salt are each monobrominated as in (2) above, and 1-amino-4-anilinoanthraquinone-2-sulphonic acid is monobrominated in aqueous suspension in presence of iodine and hydrochloric acid.