Indigo dye though rich in blue colour has poor affinity for cellulose cannot penetrate too well and thus it mostly remains at the surface of the fabric after dyeing. This phenomenon is called ring dyeing. Such ring-dyed materials have poor rubbing fastness towards dry and wet test methods. Our objective in this paper has been to use rare earth (RE) salts to overcome the rubbing fastness problem. The RE metals used in this research work is Cerous sulphate, Lanthanum chloride and Yttrium chloride.
展开▼
