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OK, so that espresso brunette color is giving you the jitters, and it's really just got to go. Don't panic, that's why some brilliant scientist invented color remover. These magic potions are like a big eraser and will have that nasty color long gone in no time. If possible, try to choose a remover that shrinks the color molecules so they can wash away -- these are the gentlest.
Head to the beauty supply store and get a color remover. Some are capable of removing just the artificial color (if you went darker than your natural color) but some might lift your natural color too. That will mean you'll have no choice but recolor once you've ditched that dark brown hue. So you might as well pick up a new hair color while you're at the beauty supply store if that's the kind you end up getting.
Put on some old clothes or put a cape on to protect your clothes. Just like you wouldn't wear that new Lululemon sweater to color your hair, don't wear it to remove your hair color, because it'll get just as trashed.
Mix up the color remover according to the product directions. Put some latex gloves on so you don't wreck your pretty nails.
Apply the color remover from root to tip and massage it into your hair. Really get it into all your hair, because any sections missed won't lift properly. Set a timer for the recommended time.
Keep an eye on your hair the whole time. Sure, the company will recommend a processing time, but you need to rely on your eye more than an egg timer. Once your hair as lifted to either your natural color or a light enough base to recolor, get that color remover off and pronto.
Rinse the color remover off with warm water. The water doesn't need to be hot, but warm water will help further open the cuticle and rinse the pigment out. Shampoo your hair to remove any residue of the remover.
Assess your tresses. If you managed to get back to your natural color, then you can leave well enough alone for one day. If your hair still needs some color therapy, you can now mix and recolor your hair.
Use a color remover ASAP for the best results in color removal. The fresher the color, the easier it will come out.
If you're hair was bleached a very pale blonde, then you dyed it dark brown, your hair may end up being a bit stained, which color remover might have a hard time removing.