What does the strand test determine?

The strand test is a crucial step in the hair coloring process as it allows a cosmetologist to see how the hair will react to the chosen color formula. By performing this test, the stylist can assess the hair's response to the dye, including the final color achieved and the time required for the color to develop effectively. This information is essential because different hair types and conditions can influence how a color will process, ensuring that the final result aligns with the client’s expectations. Additionally, this test helps determine if any adjustments need to be made to the formula or the processing time to achieve the desired outcome.