Final answer:
The cotton in a permanent wave procedure should be removed after thoroughly rinsing the hair post-neutralizer application, to protect the scalp from chemicals and absorb any excess solution.
Step-by-step explanation:
In the permanent wave procedure, the cotton should be removed after the hair has been thoroughly rinsed with water following the neutralizer solution application. During the process, a reducing agent, usually ammonium thioglycolate, is applied to the hair to reduce and break some of the disulfide bonds, which are responsible for the hair's strength and structure. After processing, the hair is rinsed, and a neutralizer is applied to reform new disulfide bonds to create the new curl or wave configuration. Once this neutralization step is complete and the hair has been adequately rinsed, the cotton that was used to protect the scalp and absorb excess solution can be safely removed.
In a permanent wave procedure, the cotton should be removed after the application of the reducing substance.During the permanent wave process, the reducing substance, usually ammonium thioglycolate, is applied to the hair to reduce and rupture some of the disulfide cross-links. This allows the hair to be molded into the desired shape. The cotton is typically used to protect the scalp and skin from the chemical solution, and it should be removed once the reducing substance has been applied and the desired amount of time has passed.