Lol, silly .Kia! I dyed my hair green once (it was supposed to be blue darn it!!!) my friend did my hair, and I did hers. And of course hers came out to the exact purple it showed on the box, but mine? Noooooo .I guess that's why .I don't let people touch my hair now. But .I do have a free hair-do to be done by my moms cousin at her salon. I want to have it thinned and highlighted!
And to your question, .I would imagine it's still ok as long as it hasn't been mixed. Also if there isn't an expiration date on it, .I'd assume it's good for a very long time. If you use it, my fingers are crossed that your hair doesn't turn pink! And even if it does, pink is in these days!!