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grey, when it is used, usually means not in the index at all - so you see it for new pages. Once upon a time, some used it for banned pages too - but I'm not so sure any still do that.
white means in the index, but pr=0. But if that bar does not use grey, it may mean not in the index at all.
Whatever system they use, the information is always at least three months out of date, so I'd not worry.