I have bleach blond hair only on the top, sides, & crown of my head.  My natural is dark brown almost black!  My roots are about 3inches grown out.  I don't want to put bleach back on them and since it's winter I want to gradually go back brown.  How do i cover the blond up so it doesn't fade and turn green or even a dull brown??  All comments are welcome im willing to try anything thanks ?