Question: what is the difference between acid and alkaline perms?
Answer: Acid perm lotion is gentler and has a pH value of approximately 6 to 7. Alkaline perm lotions have a stronger pH value of approximately 9.5. They use ammonium thioglyocolate, which can be more damaging if used on the wrong hair texture. Alkaline perm lotions are best suited for normal or resistant hair types.