Abstract: Mixed disulfoanthraquinonemono-, di-, or polycarboxylic acids produced by the direct sulfonation of an anthraquinone of the formula: ##STR1## wherein n is an integer of 1-4 and each R is independently selected from alkyl of 1-4 carbon atoms and chlorine with at least one R being alkyl and with the proviso that substitution in a single ring is limited to mono, di- or tri-substitution and substitution in two rings is limited to mono or di-substitution in each ring.The mixed disulfoanthraquinonemono-, di-, or polycarboxylic acids have exceptional utility in the Stretford Process.

Abstract: A series of water soluble azo dyes for dyeing polyamide fiber material are provided by coupling an appropriate diazotized aminobenzene into an appropriately substituted N-alkyl-N-benzoxyethylarylamine. The dyes are characterized by the presence of one sulfonic acid group, either as the free acid or in salt form, and by the presence of a benzoate ester group. When dyed from an appropriate dye bath, these dyes produce dyeings on polyamide fiber material characterized by outstanding lightfastness and excellent transfer properties.

Abstract: Polyester fibers, particularly poly(ethylene terephthalate), is dyed in bright, fast shades with p,p'"-dihydroxytrisazo compounds.