Coloration process

Process for coloring synthetic polyamide textile materials to produce level coloration having excellent wet fastness properties which consists essentially of applying to the said textile materials by a dyeing, padding or printing process an aqueous dispersion of pH less than 7 containing a disperse dyestuff of the azo, anthraquinone, nitro, styryl or quinophthalone series containing a carboxylic acid group, said application being carried out in the presence of a tanning agent selected from tannic acid, vegetable tannin, condensation product of naphthol, naphthalene sulphonic acid and formaldehyde, condensation product of phenol, naphthalene, formaldehyde and sulphuric acid, condensation product of dihydroxydiphenylsulphone and bisulphite, condensation product of naphthalene sulphonic acid, dihydroxydiphenylsulphone and formaldehyde, condensation product of dihydroxydiphenylsulphone sulphonic acid and aliphatic aldehyde or condensation product of sulphurized phenol, naphthalene and formaldehyde.