Bill, I'm sorry you didn't get an earlier reply...I guess most folks here are like me and only check in once a week or so. It's probably far too late to try and preserve the rose petals using silica gel, or even by pressing. I'd suggest your son buy a bag of rose-based potpourri, and add the wedding rose to it.

By the first anniversary, perhaps he can give her roses, learn here how to preserve them, and then make her mirror frame. It's really a sweet thought. jo