Lighter Hair Color
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You simply need to visit your beauty supply store and select the hair color you want and mix it with a 30-volume peroxide developer in equal parts. After applying the color mixture and covering the hair with a plastic cap, be sure to use a hair dryer to warm the hair and maximize the lifting action.
Be sure to review our articles on Hair Coloring and pay attention to the base colors of the black hair dye you used as well as the new color to avoid any unfortunate results.
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See also:
The different types of dye
What does the hair color developer do?