Dye mixtures comprising at least two metal free dyes, one of which contains two to eight sulfo groups and the other three to eight sulfo groups, the mixture comprising at {HEAD ~ most one dye} having {TAIL ~ two sulfo groups}, are used for the dyeing of leather 
having
Dye mixtures comprising at least two metal free dyes , one of which contains two to eight sulfo groups and the other three to eight sulfo groups , the mixture comprising at { HEAD ~ most one dye } having { TAIL ~ two sulfo groups } , are used for the dyeing of leather
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