Ohio Cosmetology License Practice Exam 2025 – 400 Free Practice Questions to Pass the Exam

Before applying any chemical service, performing a patch test on the client is essential. This test is a crucial safety measure that helps to determine if the client has any allergic reactions or sensitivities to the chemical product being used. It involves applying a small amount of the product on a discreet area of the skin, usually behind the ear or on the inner arm, and observing the area for any adverse reactions, such as redness, itching, or swelling.

Conducting a patch test ensures that the service can be performed safely and minimizes the risk of causing harm to the client during the application. This preventative step is standard practice in the cosmetology field, as it helps protect both the client and the stylist from potential allergic reactions and discomfort.

While preparing the workstation, mixing the chemical product, and cleaning the client's hair are important steps in the overall process of providing a chemical service, they should follow the patch test to ensure the client's safety first and foremost. Each of these subsequent steps can be done after confirming that the client does not have any adverse reactions to the product, thus maintaining a safe and effective service environment.