my #613 hair is too DARK!!!

what type of hair is it? generally hair extensiosn are sooo processed they dont lift very well .

Yeah, I've done this several times myself, with mixed results. I've rarely gotten a human 613 that was light enough--some were closer than others--so sometimes there's no other option; it does compromise the hair quality, though.

I'd try what Sherrie recommended first: the Shimmer Lights. If that doesn't do the trick, though, and you can't otherwise use or resell the hair, then you'll probably want to lift it. I wouldn't even bother with a high-lift peroxide, really, since it probably won't take the hair any lighter than it is, or if it does, it'll oxidize quickly. I'd use Feria 205 Extra Bleach Blonde, and do a strand test first. Most importantly, watch the hair like a hawk--the moment you reach the desired lightness, wash the bleach out immediately and thoroughy.

Good luck! :)

Blondie, definitely try the violet shampoo first.  Clairol Shimmerlights or ARTec White Violet.  If that doesn't work, then...well, not to contradict Jenny, but I worry that the Feria would be too harsh (I don't know what volume the bleach blonde is, but regular Feria uses a stronger developer than most box dyes).  Maybe Wella Speedlite bleach with 20 volume developer.  Also know that white hair should not be bleached white, just super pale yellow, then the violet shampoo kicks in.