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Commercial polymer chemicals are provided as auxiliaries for improving the color fastness to crocking of dyed fabrics. Indigo and sulphur dyes, the principal class of dyestuffs used to produce jeans, were used. The dyed fabrics present low dry-wet crocking fastness. Application of polyacrylic and polyourethane polymers to the dyed fabrics by aftertreatment process results in the fastness to crocking improvement of Indigo and CI Sulphur Black 1 dyed cellulosic fabric, whilst retain its otherdoi:10.20431/2349-0403.0310005 fatcat:3fkx6d3hyjavpcni5w5e4i4mre