Barb -

It is used by museums for anything from guns to paper, it won't leave residue on paper, quite a feat, to protect it.

I would assume that silver would be just fine. Just remember that a little goes a long way, it has some sort of molecular structure that allows it to spread, it's quite remarkable really.

There is a decent description for some of the things that it can perform on the paper that comes with it.

Perhaps try Gooling it and see if there is a better description?