I just dyed my hair a red colour and its gone quite patchy!! I really want to go back to either a brown or a dark brown. I take it the best way to do this other than spend a fortune in a salon is to use black? My hair's been black before and I don't mind it being black again esp as I have a no 2 haircut!! I presume that black will almost def cancel the red out? Can anyone please help me!?