Tennessee Cosmetology Practice Exam 2025 - Free Cosmetology Practice Questions and Study Guide

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

To determine color longevity

To identify allergic reactions

The purpose of a patch test in hair coloring is to identify allergic reactions. Conducting a patch test involves applying a small amount of the hair dye on a discreet area of the skin, usually behind the ear or on the inner arm. This allows the individual to observe any potential allergic responses to the hair dye ingredients before proceeding with a full application.

Allergic reactions can range from mild irritation to severe responses, including swelling or hives, and performing this test helps prevent adverse effects during the hair coloring process. It's a crucial safety measure to ensure that the client does not have a sensitivity to any of the chemicals present in the dye, which is especially important since hair coloring products can contain various allergens. This step helps maintain the overall health and safety of the client while also ensuring a positive experience in the salon setting.

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To test color effectiveness

To check hair texture

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