What is the purpose of a Processing Strand Test?

The purpose of a Processing Strand Test is to check the evenness of color absorption. This test is crucial during the hair coloring process because it allows the stylist to verify how the hair will absorb the color treatment and to ensure that the resultant shade will be uniform. By taking a small section of hair and applying the color, the stylist can observe the results and make any necessary adjustments to timing, application techniques, or product selection to achieve the desired, even color throughout the entire head of hair. This step is particularly important as different areas of the hair may have varying degrees of porosity, which can affect how the dye adheres and processes.