I have been dying my hair for a few years now from brown to blonde, but I got sick of dark routes showing through and I am getting older so I decided to go back to my own colour, I picked a brown hair dye, and thinking I knew it all I didn't really look at the box, just the colour, my hair is now green in places, when I looked at the box the dye was from a vey dark to a lighter brown hair, I cannot afford to go to a professional, is there anything I can do and what colour dye do you think would help, thank you