Salicylic acid solution cloudy with polysorbate 20 during processing
Thanks to the many questions and answers I found using the search feature, I was able to come up with this simple formula and process for a salicylic acid toner. However, I have come across an issue, and I am wondering if I can get some help with this formula or process. One other person already asked this but never returned with feedback. I have tried the suggestions offered in that thread, but nothing has worked.
My simple toner turns cloudy the moment I add polysorbate 20. 24 hours later - it appears clearer, but I noticed a gel-like sediment at the bottom, which I think is the polysorbate 20. When I agitate the solution, it is cloudy again. The final pH is 3.55 without any adjusting. Here are the two versions I have tried so far.
Sodium Citrate 1%
T. EDTA 0.1%
1,3 Propanediol 13%
Propylene glycol 12%
Salicylic acid 2%
Polysorbate 20 2%
Sodium Benzoate 0.3%
Same as version 1, except Propanediol increased to 16% and Propylene glycol 14%.
1. Add Sodium citrate and Sodium Benzoate to water and heat to 75c
2. Add Salicylic acid to glycols, mix until clear and then heat to 75c
3. Add Salicylic solution to water slowly, before the temperature reduces to <70c - (the solution is clear)
4. Add polysorbate 20 (This is when it turns cloudy)
Both processes resulted in a cloudy solution which gradually becomes clear with a gel-like sediment at the bottom. Anyone know what might be happening here? Thank you