_____ waves are perms using an ingredient that does not evaporate as readily as ammonia, so there is very little odor associated with their use.

_____ waves are perms using an ingredient that does not evaporate as readily as ammonia, so there is very little odor associated with their use.

• A. Ammonia-free
• B. Acid-balanced
• C. Neutralizing
• D. Hydrogen peroxide

Answer: (A)

Odor in perms largely comes from ammonia released by the reducing agent in traditional solutions. Ammonia-free waves use a reducing agent that does not release ammonia as readily, so there is very little odor during application. The rest of the process is the same: the reducing agent opens the hair's disulfide bonds so the strands can take on a new shape, and then a neutralizer reoxidizes the bonds to lock the curl in place. The other options describe factors like pH balance, the neutralizing step, or the oxidizer used, but they don’t address odor in the same direct way as choosing an ammonia-free formula.

Odor in perms largely comes from ammonia released by the reducing agent in traditional solutions. Ammonia-free waves use a reducing agent that does not release ammonia as readily, so there is very little odor during application. The rest of the process is the same: the reducing agent opens the hair's disulfide bonds so the strands can take on a new shape, and then a neutralizer reoxidizes the bonds to lock the curl in place. The other options describe factors like pH balance, the neutralizing step, or the oxidizer used, but they don’t address odor in the same direct way as choosing an ammonia-free formula.