I'm going to be honest because I wish someone had been honest with me before I bought it. My hair is really white, not just gray. The first try was good but not perfect. Some areas around my temples weren't fully covered. I left it on for 15 minutes instead of 10, and the second try was much better. So yes, it works even on very white hair, but you may need to leave it on a little longer depending on your situation. 4 stars because it's honest.
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