These are designed to lower the pH of the final rinse in the washing machine and ensure that all residues of chemicals used in the process are removed. These are also used to remove the traces of rust present in the water to prevent the greying or yellowing of the fabric during finishing. This is important as failure to remove certain common wash chemicals could lead to textile damage or reduction in productivity and also can cause the skin irritation in certain cases.

Midchem range of sours are both in powder and liquid form to take care of the residual alkalinity, chlorine and rust depending upon the nature of products used.