It's probably fine. It's mainly hydrogen peroxide and doesn't really have any dyeing capability, it just bleaches your hair to orange or yellow. So, even if it's not as powerful as it would have been fresh, I doubt it would hurt anything.
It also completely fries your hair, so please only use it if you like to keep a short haircut. For some reason my hair gets much less fried when I dye it blonde with real stuff than it does when I sun-in to dark yellow.
Making metal barettes/concord clips hair safe, long hair style how to: http://alonghair.wordpress.com
Thanks for the quick replies. My hair fortunately hasn't gotten affected by sun-in in the past, i just wanted to lighten the ends a bit as there's a lotta build from past colorings of red. I prefer that over bleaching and i would only do it on afew small strands to match the top half of my hair!
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