When should a patch test be performed prior to a chemical service?

A patch test should be performed before any chemical service on a new client to ensure that the client does not have an allergic reaction to the product being used. This test is essential in the practice of cosmetology because even clients who have had similar services in the past may develop sensitivities or allergies to certain ingredients in chemical formulations. By conducting a patch test, cosmetologists can identify any adverse reactions before applying the product to a larger area, thereby safeguarding the client's health and preventing negative experiences.

This practice is standard protocol and helps maintain the safety and trust in the client-cosmetologist relationship. It is crucial for protecting clients and ensuring that they have a positive experience with chemical services, whether it's coloring, perming, or any other chemical treatment. Not performing a patch test can lead to undesirable outcomes and potential harm, which is why it is essential for every new client, regardless of the specific service being performed.