From black to platinum - can it be done?

I'm not asian myself. But I'm pretty positive that she could reach platinum in one step (I remember you said you where going to do streaks on her hair) if you're only using the right products.

Try a good off the scalp bleach like Clairol Basic White 2 (BW2) and mix it with 50 volume developer (do not use anything lower than 50 cause then I don't think she can reach white/platinum) and also add red gold corrector to the formula. Do the foils and then leave it on for up to 90 minutes (do not wash out untill the hair is light enough)

If you're afraid it won't get her all the way to platinum you could always just do one streak first and see how it turns out. You could acutally leave the bleach on a for 120 minutes if necessary, but after 90 minutes the bleaching effect slows down..

Yes, it will take several steps. But it sounds like you have a plan. As long as you're working with a professional, I think it should be fine. There's less of a worry because she'd only be getting streaks, not the whole head, platinum.

Anais