I do hair the best way is to strip it/bleach it to remove all color and then dye it watever color u want too..but the only thing is leaving bleach in ur hair for too long will cause it to come out another color....my advice go to professionals...GOOD LUCK@!!!
try L'Oreal's Color Zap for a quick at-home reversal of your color blunder. This easy-to-use kit works after one application, gently removing dye from your hair while leaving your natural hair color intact and ready to re-color. This product works even on permanent hair dye.