Reddit reviews Color Oops Developlus Color Oops Color Remover (extra Strength)

I don't know what you have access to in Iceland, but I've always had decent luck with Color Oops. It won't bring you back out to your natural blonde, but it should pull enough of the black out that you can take another stab at auburn.

I've also had success with One 'n Only Colorfix.

Since it's been a few months since the black dye went on, and it was so light before, you may even be able to get away with just bleaching it.

There is an AWESOME color remover called "Color Oops", you can buy it at places like Walgreens and such. Here's info from Amazon. You HAVE to follow the directions precisely for it to work. I was able to strip off semi-permanent (or permanent, can't remember now) black dye and get back to something semi-normal that I could then re-dye with something lighter.

It was the best thing ever. Totally saved me a trip to the salon!

Since your hair is dyed a dark colour, you will need to lift the colour somehow. I recommend using Color Oops a couple of times before reaching for the bleach because it's really gentle on hair and does a pretty good job of lifting. If you still can't get it light enough (and you will want it as light as possible), then go ahead and use bleach.

For the purple itself... what dye you buy will depend on which one you find that matches what you want. My hair is purple and I use Splat Lusty Lavender. Whatever you get, though, you will want to do the dying immediately after bleaching. Get your hair nice and dry and drench your hair in the stuff. It will stain EVERYTHING. I MEAN EVERYTHING. So cover your hands, wear old clothes, and cover the area you're dying in with an old towel. After that, try to take colder showers because it will help with the fading... every time you shower, it will look like you're squeezing grape koolaid out of your hair. The stuff is going to fade fast, no matter what you do, so just do what you can. I usually get about 5 weeks out of mine before I feel like I have to redye it, and by that time it's lavenderish.

Good luck! Purple hair is amazing.

Edit: Here's what it looked like right before I redyed it last time.

Is it a permanent dye? If not, you can use Color Oops! to get the dye out (I've seen it for sale at Walgreens before). I've also heard washing with dish soap will remove temporary dye faster than regular shampoo - but that could be untrue. I'd wait a few days, wash your hair several times, deep condition and see how you feel about the color after giving yourself a few days to get used to it. I think you're supposed to wait several days before coloring your hair again.

You can buy a product called color oops to remove the dye. Most drugstores sell it.
http://www.amazon.com/gp/aw/d/B0012JY4G4/ref=redir_mdp_mobile/180-7381760-6285053

Honestly I had this same problem a few weeks ago, and did all of these things but none worked for me. I strongly recommend Color Oops, which is gentle on your hair and pretty much a lifesaver. It works best when a) used soon after hair dying (as in, not six months later) and b) going back to lighter color.

Good luck!

Well, I've never used this but I've heard good things. I usually just dye over my previous hair color.