South Dakota Cosmetology Practice Exam 2025 – 400 Free Practice Questions to Pass the Exam

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What is the role of a patch test in hair coloring?

To test the dye's effectiveness

To determine if a client has an allergic reaction to the hair dye

The role of a patch test in hair coloring is primarily to determine if a client has an allergic reaction to the hair dye. This procedure is crucial for client safety, as hair dyes often contain various chemicals that can trigger allergic reactions in some individuals. By applying a small amount of the dye to a discreet area of the client’s skin—usually behind the ear or on the inner arm—stylist can observe for any signs of redness, itching, or swelling over a specified period, generally 24 to 48 hours.

Conducting a patch test helps prevent potential adverse reactions that could occur during a full hair coloring treatment, thereby protecting both the client and stylist from the complications associated with allergic responses. This proactive measure is a standard practice in the cosmetology field.

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To check if the hair color matches the client's skin tone

To decide the correct application technique

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