what is a developer in hair class
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Developer is a product containing hydrogen peroxide that aids in the bleaching/toning process. The hydrogen peroxide opens up the cuticle of your hair, allowing for color to take hold. If you've seen developer at your local beauty store, you'll notice that there are many different levels. The levels refer to the amount of hydrogen peroxide present—the higher the number, the more peroxide, the more lift you're going to get.
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