I made 3 different facewash products with different Surfactants and ratios, all with high enough viscosity but adding salicylic acid 1% and 2% reduced the viscosity a lot and made it thin and undesirable viscosity in all three facewash.
Composition of one face wash in active percentage
Lauryl glucoside 1%
Glyceryl oleate 0.5% (one formula without it)
Xanthan gum 0.1%
pH 5.1 with citric acid
Salicylic acid 1%
Sodium hydroxide 10% 2.9%
I used these methods
1. Made the product, dissolved salicylic acid in sodium hydroxide and then addid to complete face wash. Viscosity decreased from thick to very runny and thin.
2. Dissolved salicylic with sodium hydroxide in water, added the rest of ingredients and made the product. viscosity didn't increase with up to adding 5% NACL.
What is the problem here and how to thicken salicylic acid 2% cleanser?