What is the role of salt in reactive dyeing?
A. Salts plays important role in reactive dyeing by improving the affinity of the dyestuff towards the fibre and acceleration of the dyestuff’s association and lowering its solubility. Normally, Glauber’s salt or common salt is used for this purpose. Less common salt is required in place of Glauber’s salt as 1 kg of Glauber’s salt contains 324 gms of sodium, while 1 kg of common salt contains 393 gms of sodium. The presence of chlorine ion in the common salt may cause corrosion of the equipment. Hence, Glauber’s salt is always preferred over common salt. Q.
