Illinois Cosmetology Practice Exam 2025 – 400 Free Practice Questions to Pass the Exam

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What is the main purpose of a patch test?

To determine hair color preference

To check for allergic reactions

The main purpose of a patch test is to check for allergic reactions. In the cosmetology field, particularly when using hair dyes, skin care products, or other chemical treatments, it is crucial to ensure that clients do not have allergies that could lead to adverse reactions. A patch test involves applying a small amount of the product to a specific area of the skin, usually behind the ear or on the inner forearm, and observing the area for any signs of redness, itching, or irritation over a period of time. If the skin remains unaffected, it is generally safe to proceed with using the product more widely on the client.

Other options, such as determining hair color preference, measuring hair length, or assessing skin texture, are not purposes of a patch test and do not address the critical safety aspect of testing for allergies before applying potentially harmful substances to the skin or hair.

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To measure hair length

To assess skin texture

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