Gray hair being bleached

I always been told that the cause of gray hair is the lack of melanin, that gray hair don't have melanin. I was wondering, If that's true, why it's turn blonde when bleached, since bleach products make their work damaging the melanin.

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  • Bleach breaks melanin apart but there's still enough there to give you color. (It mostly breaks down the non-yellow type of melanin which is called eumelanin. The melanin which provides most of the yellow color is called phaeomelanin.) Gray hair doesn't have either kind! 
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