Dyeing of melamine-formaldehyde condensation products

A process for dyeing condensation products obtainable by condensation of a mixture including as essential components

• (A) from 90 to 99.9 mol % of a mixture consisting essentially of
• (a) from 30 to 99 mol % of melamine and
• (b) from 1 to 70 mol % of a substituted melamine of the formula I ##STR36## where each Y is independently of the others hydrogen, hydroxy-C.sub.2 -C.sub.10 -alkyl, hydroxy-C.sub.2 -C.sub.4 -alkyl-(oxa-C.sub.2 -C.sub.4 -alkyl).sub.n, where n is from 1 to 5, or amino-C.sub.2 -C.sub.12 -alkyl, with the proviso that at least one Y is not hydrogen, or mixtures of melamines of the formula I, and also
• (B) from 0.1 to 10 mol %, based on (A) plus (B), of phenol, which is optionally C.sub.1 -C.sub.9 -alkyl or hydroxy-substituted, C.sub.1 -C.sub.4 -alkanes which are hydroxyphenyl-substituted, bis(hydroxyphenyl) sulfones or mixtures thereof,
• with formaldehyde or formaldehyde donor compounds in a molar ratio of melamines to formaldehyde within the range from 1:1.15 to 1:4.5, which comprises treating the condensation products in the form of fibers, yarns, threads, wovens, knits or nonwovens in an aqueous liquor which has a pH from 1 to 12 at a temperature from 20.degree. to 250.degree. C. with one or more dyes of the class of the azo dyes, anthraquinone dyes, coumarin dyes, methine or azamethine dyes, quinophthalone dyes or nitro dyes, said dyes being free of ionic groups.