From the land of the Bluenose.....when I went to the new Penny coin shop the other day I asked for some of those white holders that pop in the clear pages. I asked the price of the self sealing ones and the owner warned me that the apoxy on those types does silver no good. Stuck with the ones you staple.

For copper cream of tarter and vinegar made into a paste does great but if the patina goes so may the design.

For silver line a glass pie plate with tin foil and add silver items (do not mix with other metals like copper or gold) making sure they don't touch, pour baking soda over the lot then boiling water and fold the tin foil over. At most you may have to leave overnight and repeat a couple of times....woks great save for coins that come out of salt water areas!