Which of the following steps is not performed when offering a virgin sodium hydroxide relaxer service?

In the context of offering a virgin sodium hydroxide relaxer service, pre-shampooing the client's hair is not a standard step that is performed. The purpose of a virgin relaxer is to alter the natural curl pattern of the hair, and it is typically applied to clean hair. However, pre-shampooing is not necessary because it could remove any natural oils that help protect the scalp during the chemical process.

Instead, it is important to focus on assessing the hair's condition through strand tests, performing periodic comb tests during the application, and ensuring the service concludes with a neutralizing shampoo. These steps ensure that the relaxer is applied effectively and safely while maintaining the health of the hair and scalp.

Therefore, removing oils through pre-shampooing may pose risks, whereas the other steps are crucial for monitoring the application and ensuring proper processing.