Howlong does it take for hydrogen peroxide to change the color of your hair if its black. (Red Ranger)

Not medical advice: Always wear gloves when using hydrogen peroxide to lighten hair color. Once applied it should be left on overnight (a shower cap comes in handy here.) Avoid applying more than once a month and only use when diluted with water, egg yolk, honey, etc.; there are a number of combinations. All hair is unique in its resistance to lighten; one application may be enough. If another treatment is performed, the risk of hair damage increases. If overused, you may end up with no hair to lighten.
Updated on Wednesday, September 21 2011 at 07:40PM EDT
Source: www.ehow.com/...