Disulphonated acid dyes are brilliant, offer good wet fastness properties and are metal-free. However, most disulphonated acid dyes react differently to different dyeing conditions and therefore are not compatible with each other. As a result, dye formulations with multiple disulphonated acid dyes have a low reproducibility. The new Bemacid F-T dyes are optimally matched to each other and therefore offer the strongest dyeing reliability while fulfilling the desirable properties mentioned.