Hardly any other textile material demands as much attention as polyamide with regard to dye selection. Different fibre origins, multifarious fibre cross-sections and also the number of single filaments of the yarns demand the careful selection of the dye, additive system and dyeing process. By taking into account the affinity and kinetics, the matched acid and metal complex dyes demonstrate a uniform tone build-up and are thus extremely combinable. Brilliant colours with top wet fastness can be realised with optimum monetary value.