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I dyed my hair dark brown about 12 months ago and had it cut really short at the same time. Most of the colour is out now its just at the ends and its faded a lot too. I want to go back to blonde. I know my roots will go no probs but I'm worried about the ends. How will I go about this?
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I agree that it's a lot easier to let someone with experience do it. But, there are people who don't have the $$.
If you've grown your hair out for a year, you have about 15 cm of new growth. It's important to note that.
First, you'll need to remove the artificial pigment in the ends. This is best done using a color remover: ColorFix, Color Oops, Color Zap, etc. The artificial pigment in the hair doesn't react with bleach the same way that natural pigment does. If you don't get it out ahead of time, you'll have big problems.
Second, you'll need to bleach out the remaining natural pigment. Remember that the roots will bleach out faster than the ends (heat from the scalp). You'll probably have to bleach in three sections -- 1) the already-colored section; 2) the 14 cm natural section away from the roots and 3) the 1 cm nearest the root). Finally, you'll be able to tone it (dye it with a blonde dye).
Be sure and research this before you attempt it. Make sure you understand what color changes the hair will go through and how light you'll need to bleach it. Make sure you've done
strand tests (either on or off the head -- I prefer on the head) so you'll be sure of the color that you're going to get.
If you're only going slightly lighter you may be able to use a single-process haircoloring but you'll still need to use color remover on the artificial pigment. You still need to do the strand tests and the research.