1. balance(Aqueous Ammonia, 28%) : The pH of Part B should be adjusted so that the mixture of Part P with Part W has a final pH in the range of 6.8-7.2
2. Since glycerol monothioglycolate is not hydrolytically stable, it must be packed separately. Part P and Part W are mixed just prior to application. The ratio of Part P to Part W is as follows: Part A: 20-25 grams Part B: 60-80 ml Resultant pH: 6.8-7.2
3. To increase the strength of the formula, use a larger amount of Part P and/or a smaller amount of Part W.
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SOURCE: W.R. Grace & Co.-Conn.: Evans Chemetics: Formula
