What test determines how long to leave a relaxer on the hair?

The strand test is crucial in determining the correct processing time for a relaxer on the hair. This test involves taking a small section of hair, applying the relaxer, and observing how the hair responds to the product. By monitoring the hair's reaction, such as the degree of curl relaxation and texture change, the stylist can make informed decisions about how long to leave the relaxer on. This is particularly important, as different hair types and conditions can significantly affect how the hair will respond to the chemical treatment.

The strand test ensures that the hair remains healthy and avoids over-processing, which can lead to damage. It allows the stylist to customize the service for each client, taking into account factors such as hair texture, porosity, and overall health. This personalized approach is key to achieving the desired results while safeguarding the integrity of the hair.