Board Thread:Naruto Discussions/@comment-25369463-20141001042907/@comment-25343176-20141001145314

Obito was using rinne tensei changing the seal to absorb the juubi was his only way to evade it. Thats why his hair is white. It turned white prior to being the jinchurikki. Its also why madara was glowing and his skin was cracking. When hashirama saw him he even said it was rinne tensei.