It looks like a light wash of gray "editor's paint" in those areas used to enhance the contrast of the printed image. That's just looking at the scan though, and I don't think I've ever seen that have a "blue" color unless something else stuck to the paint. (FWIW, it looks more gray than blue to me, but again, I'm not looking at it in person)
The "silvering" that I have seen is usually such that you can look at the photo from one angle and it looks like a normal black/white image, but when you tilt it, you will see the light reflecting on the darker portions of the photo, giving it a silver or mirror-like effect. It can show up in scans, but those are not the areas I would expect to see it in.
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