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.