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How to prevent color change of salicylic acid in a cationic formula?
Dissolving salicylic acid in water produces a yellow color that i think it is interacting with iron in water(please correct me if i am wrong. Adding Chelating agents even 0.008% EDTA prevents this color change.
But in cationic formulas we cant use chelating agents. So my question is how to prevent this color change of salicylic acid in water in a cationic formula?
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2 Replies
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@Abdullah it may seem obvious but: omit the EDTA and try a little citric acid/sodium citrate buffer. Not as good a chelant as EDTA but at the level you describe a little dab will do you and not a viable interferant with the cationics. A little chelating will not harm a cationic formulation, only a lot will.
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chemicalmatt said:@Abdullah it may seem obvious but: omit the EDTA and try a little citric acid/sodium citrate buffer. Not as good a chelant as EDTA but at the level you describe a little dab will do you and not a viable interferant with the cationics. A little chelating will not harm a cationic formulation, only a lot will.
Thanks. I will try citric acid too.
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