Which of the following statements best describes patch testing?

• A. It Helps Determine Whether A Product Will Lighten Hair
• B. It Helps Determine If A Client May Have An Allergic Reaction To Products
• C. It Measures Hair Porosity On A Strand
• D. It Predicts Color Shade

Answer: (B)

Patch testing focuses on safety: it helps determine if a client may have an allergic reaction to products used during barbering services. By placing a small amount of the product on the skin, usually behind the ear or on the inner forearm, and checking for 24 to 48 hours for signs like redness, itching, or swelling, you can identify sensitivities before applying the product to the scalp or hair. If a reaction appears, the product should be avoided or an alternative used to prevent dermatitis or more serious reactions. This is about safety and allergy risk, not about how a product lightens hair, measures porosity on a strand, or predicts the final color shade.