What is the purpose of a patch test before a chemical treatment?

The purpose of a patch test before a chemical treatment is primarily to check for allergic reactions. This precautionary step is essential in the beauty industry because many chemical products can contain strong allergens that may cause adverse skin reactions in sensitive individuals. By applying a small amount of the product to a discreet area of skin and observing it for a designated period, typically 24 to 48 hours, professionals can identify any potential allergic reactions before proceeding with a full application. This helps to ensure the safety and well-being of the client, minimizing the risk of discomfort or more serious skin issues during or after the treatment.

While determining product effectiveness, assessing hair condition, and evaluating skin tone are important aspects of beauty treatments, they do not specifically relate to the primary objective of conducting a patch test.