[Formulator]

@suswang8
 
7.5% butylene glycol and 7.5% ethanol are not enough to dissolve 2% salicylic acid. That’s why salicylic acid recrystallises, when you dilute phase B with water. Keep increasing percentage of ethanol and/or butylene glycol until salicylic acid is dissolved, even after adding phase A.
I would also suggest using distilled water instead of brewed white tea, as the latter can impact microbiological quality of your finished product.