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