Dye mixtures comprising {HEAD ~ at least two metal free dyes}, one of which contains two to eight sulfo groups and {TAIL ~ 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 
contains
Dye mixtures comprising { HEAD ~ at least two metal free dyes } , one of which contains two to eight sulfo groups and { TAIL ~ 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
OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH REL OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH