Hi headless rat- Im with hectic on this one- I had very blonde hair 6 months ago, and went to a hairdresser to get it a medium brown but it came out black. I hated it so much and the only way I could sort it was to get it stripped. It then went a brassy orange colour, had to live with that for a few weeks then got low peroxide highligts put through the top to try get it blonde again. Im blonde again now but my hair was absolutely destroyed and is only starting to get back to normal now, I had to get loads cut off as well. So my advice is leave it alone now, i dont think it will go back to your previous colour, if you mixed 2 bottles together with the 2nd kit you bought then it will last a good while. If you want it blonde again give it a few weeks to chill out then go to a hairdressers to sort it. And give it weekly deep conditioning treatments as well. Good luck love x