Acid salting is when you add HCl gas to an Amine to turn the freebase Amine dissolved in dry ethanol into an HCl salt. An example is bubbling HCl gas to turn freebase Propylhexedrine dissolved in ethanol into Propylhexedrine HCl. It also works with Amphetamine (A), Methamphetamine (MA), Ethylamphetamine (EA), MDA, MDMA, MDEA, Mephentermine, Modafinil, Propranolol, and more. Adding HCl acid solution works too, but it's more difficult to get powder and crystals.
Tony: I'm acid salting Propylhexedrine freebase dissolved in ethanol to turn it into Propylhexedrine HCl powder. Then cleaning it with dry Acetone.