It depends on how dark your natural hair color was. This is tricky, because if one doesn't do this right, you'll end up with hair that has a green or violet cast, etc. This is what happens when people color their hair a neutral or ash brown thinking it will take them back to their natural color. Reason being is that the previous bleach job removed the underlying warm pigments(red and gold), and if one just adds a neutral/ash color, one will get either a bluish or violet cast(from the neutral shade)or greenish(from the ash shade). It might take a couple of steps to get you back to your natural shade, and even then, you still have to treat your hair as colored, until it all grows out. Best to see your colorist for this type of corrective work - DON'T try to do this yourself.
Even MORE reason to have a pro do this. Also, even though you'll be back to what looks like your natural color, it's still "colored" and has to be treated as such until your virgin hair is completely in, as in all the left-over colored hair being cut off while it's growing. Best of luck!
Just let it grow out. That is what I do. I bleached my hair about a year ago and put different colors such as pink and blue in it but I let it grow out once I was bored with it because I knew it would be twice as damaged. But now I bleached it again and if I get bored I will do the same thing
I believe its impossible to return processed hair to its beginning color no matter what you do, id say just dye it back to a similar color to yours and then grow out your hair meanwhile little by little trimming away the dyed parts
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