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So the black hair color isn't really working for you, is it? If you need to lighten up your hair a bit, there are a few options to take that black dye up a notch or two on the old color scale. Some methods are quicker, and more effective, than others, but quicker usually means tougher on your hair, so choose wisely, my friend.
This little trick will only work if the black hair color you used was a semi-permanent hair color. Clarifying shampoos, which are designed to get rid of yucky styling products or chlorine build-up, can also speed up the fading process of semi-permanent hair colors. Slather on the clarifying shampoo once or twice a week until you get the lighter shade you want. Just don't over do it. These shampoos strip the natural oils, as well as the color, from your hair, so you could end up with some seriously dry hair if you go crazy with it.
A shampoo cap is the perfect choice if you want to lighten a permanent black hair just color a little bit and don't want to risk damaging your hair with stronger products. To mix up a soap cap, pour equal amounts of shampoo and 20-volume peroxide into a color bowl and mix it thoroughly. Put some latex gloves on to protect your hands and apply the shampoo cap all over your hair. Lather it up like you're washing your hair, but keep an eye on that hair color. This stuff can work fast, so the minute it's looking light enough, it's time to rinse and condition.
A color remover is your only other option if you need to seriously lighten that black hair color but don't want to use bleach and peroxide. You can pick up a color remover at your local beauty supply shop; just make sure you follow the directions to the letter. These products will lift the artificial pigment you put on your hair, but it's unlikely you'll love the color you're left with without some tweaking. A semi-permanent color close to what you're left with, but a little less flat, should do the trick.
Bleach and Tone
This is really a last resort -- it should only be used if you absolutely cannot stand the black hair color and nothing else is going to get your hair as light as you want it. This method is probably best left to the pros, because you could totally fry your hair trying to get your black-dyed hair to the color you want if you try this at home. For best results, your hair should be bleached using a 30-volume peroxide and only lifted to the red-orange stage. You can then put a level four hair color on top and you'll have lighter, dark brown hair color. Don't try to go from black to light brown or blonde in one go, because the only thing you'll get is fried hair that will likely fall out. Baby steps, girl, baby steps.