Hello team I want to make a 2% facial toner BHA I use it myself Salicylic Acid simple 2% soluble in 1,3- Propanediol ? At first I thought I would use Compl. ex but because I intend to put 1,3- Propanediol to feel good, moisturize and help. กันเสีย so I think that if the normal type is soluble it wil...