Which statement accurately contrasts alkaline and acid perms?

• A. Alkaline perms use a strong base with high pH (9.0–9.6); acid perms use a lower pH (6.5–7.0); alkaline perms process quickly and swell; acid perms may be slower.
• B. Alkaline perms operate at a pH around 6.5–7.0; acid perms operate around 9.0–9.6.
• C. Alkaline perms require no neutralizer.
• D. Acid perms never require heat.

Answer: (A)