The Art Conservation Research Center at Carnegie Mellon University is all full of PhD’s and what not. If you have something real valuable and think it might be slipping away, and have a question, and speak PhD chemistry, you might find this to be a good resource. If you don’t happen to have the right initials behind your name, you will probably have to hit the Yellow Pages (?) or Google to find a local preservation expert. But read my articles on Armature Preservation first. Cheaper then an expert and I don’t speak PhD either!