What is the purpose of a chemical solution that stops the waving process of a permanent wave?

The purpose of a chemical solution that stops the waving process of a permanent wave is to rebuild the bonds in the hair. During the perming process, the hair's disulfide bonds are broken to allow it to take on a new shape. Once the desired curl or wave is achieved, a chemical solution is applied to reform these disulfide bonds in their new position, thus "locking in" the curl. This step is crucial because it ensures that the new shape of the hair is maintained after the curling rods are removed and the hair is rinsed. The rebuilding of bonds effectively stabilizes the hair structure, allowing the curls to last longer and remain intact through various conditions.

Other options such as color enhancement, preparing the hair for curling, and enhancing moisture retention do not specifically address the core purpose of terminating the waving process effectively and reinforcing the new shape of the hair after the chemical treatment.