What is the purpose of a patch (predisposition) test?

• A. It Determines Scalp Health
• B. It Determines If The Client Is Allergic To Haircolor Products
• C. It Estimates Color Shade
• D. It Determines Hair Density

Answer: (B)

The main idea is safety screening for chemical services by checking for a possible allergy to haircolor ingredients. A patch test places a small amount of the product on the skin (often behind the ear or on the inner forearm) and monitors for a reaction over about 24 to 48 hours. If there’s redness, itching, or swelling, that indicates a potential allergy, and the product should not be used for that client or an alternative should be chosen. This test isn’t about scalp health, estimating shade, or hair density—the information it provides is specifically about whether the client may react to the dye.