What is the purpose of a patch test before a color service?

The purpose of a patch test before a color service is primarily to check for allergic reactions to the dye. This procedure is essential to ensure client safety, as some individuals may have sensitivities or allergies to certain hair coloring ingredients. By conducting a patch test, which typically involves applying a small amount of the dye to a discreet area of skin and waiting 24 to 48 hours, a stylist can observe any adverse reactions, such as redness, itching, or swelling. If any reaction occurs, it would indicate that the client should not proceed with the color service using that specific product, thereby preventing potential harm.

While determining the best color choice, assessing hair condition, and predicting color longevity are important aspects of a color service, they do not directly relate to the critical safety assessment that the patch test provides.