{HEAD ~ Dye mixtures} comprising {TAIL ~ 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 most one dye having two sulfo groups, are used for the dyeing of leather 
{ HEAD ~ Dye mixtures } comprising { TAIL ~ 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 most one dye having two sulfo groups , are used for the dyeing of leather
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