pH requirements for organic sunscreen filters
Are any of the following organic filters known to display instability if formulated in an emulsion at a pH ~5?
I’ve heard these filters work best closer to neutral pH, but I haven’t seen anything on these ingredients specifically. They are all oil soluble as well so I’m having trouble understanding why a slightly acidic pH might be problematic. I have not formulated suncare products before, so I may be missing something obvious
On a related note, if there are any textbooks/ resources for sunscreen formulation that anyone can recommend it’d be much appreciated.
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