Nevada State Board of Cosmetology Practice Exam

Question: 1 / 400

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

To determine hair compatibility

To check for allergic reactions

The purpose of a patch test in hair coloring is to check for allergic reactions. Before applying any hair dye or color product, it is crucial to assess whether the client is allergic to any of the ingredients in the formulation. This is typically done by applying a small amount of the product to a discreet area of skin, usually behind the ear or on the inner elbow, and observing it for a specified period, usually 24 to 48 hours.

If an allergic reaction occurs, such as redness, swelling, or irritation, it indicates that the product should not be used on the client. This test helps ensure the safety and well-being of the client, as allergic reactions can range from mild to severe, and in some cases, they can lead to significant health issues. Hence, the patch test is an essential preventive measure in the hair coloring process.

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To select the right hair color

To test for hair damage

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