Process for discharge or reserve printing on synthetic fibers: formaldehyde sulfoxylate and hexamethylene tetramine

In a process for disperse dyeing of a synthetic fabric with dispersion dyes by the discharge or discharge-resist method wherein said fabric is padded or printed respectively with a padding liquor or printing paste containing at least one dischargeable dye;

• said fabric is dried under conditions which do not result in fixation of the dye, or alternatively said fabric is dried under conditions which result in fixation of the dye;
• said fabric is printed with a mixture comprising a discharge agent, or alternatively a discharge agent and at least one discharge-resistant dispersion dye;
• and said dischargeable dispersion dyes are fixed, or where contacted by said discharge agent, destroyed;
• the improvement wherein said discharge agent comprises a mixture of
• (A) about 5 to about 50 parts by weight of a compound having the formula:
• ##STR6## wherein Me is selected from the group consisting of sodium, potassium, ammonium and alkyl-substituted ammonium groups, or an ammonia derivative derived from the reaction of ammonia or of an ammonium derivative containing at least one hydrogen atom bonded to the nitrogen with alkali metal or an ammonium salt of methane sulfinic acid,
• (B) about 5 to about 50 parts by weight of hexamethylene tetramine, and
• (C) 0 to about 20 parts by weight of anthraquinone.