Hope someone can offer some help on this. I made a 30% Salicylic Acid Peel solution (I made about six bottles, 120 ml ea) and the next day there were crystals at the bottom that formed. What could have caused these crystals.
I added the Salicylic Acid, powder form, in SDA 40, added a little heat until acid dissolved and then added NaOH to adjust pH.
Also, if I made this un-buffered and did not use NaOH to adjust pH, maybe I could avoid this next time?