Colorado Cosmetology Written Practice Exam

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How often should a patch test be conducted before using hair color products?

  1. Every application

  2. Once a week

  3. Every 30 days

  4. At least 48 hours before each application

The correct answer is: At least 48 hours before each application

A patch test should be conducted at least 48 hours before each application of hair color products. This is to ensure that you are not allergic to any of the ingredients in the product. Option A is incorrect because conducting a patch test for every application may be excessive and unnecessary. Option B is also incorrect because once a week is not a specific enough timeframe for conducting a patch test. Option C is incorrect because every 30 days is not frequent enough and you may develop an allergy to the product in between tests. The recommended timeframe for a patch test is at least 48 hours before each application.

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