A predisposition test should be performed how many hours before a color service?

A predisposition test, also known as a patch test, is performed to identify any potential allergic reactions a client may have to hair color products before a color service. It is typically advised to conduct this test 24 to 48 hours prior to applying color. This timeframe allows enough period for any possible allergic reaction to manifest, ensuring client safety and comfort during the subsequent color service.

Conducting the test within this specific window helps professionals identify sensitivities or allergies that could cause irritation, redness, or more severe reactions. By recognizing these responses early, hairstylists can avoid complications during the actual color application process. Thus, performing the test 24-48 hours prior aligns with safety standards in the beauty industry, providing ample time for observation while minimizing risk for the client.