Doc, I would not agree with you about keeping medals in a plastic bags. When I moved to USA I conserved my entire collection in a small plastic ziplog bags. When I transferred my staff two years later to NewYork I found that brass medals got some ugly dark spots on their surface. I believe it's because of some chemical component of plastic. If you keep a brass medal enclosed in such envelope for a long time it might be some type of reaction between the metal and polyethilene compound of plastic bag.
Silver and gold items remained intact.
So for the last few years I keep my medals on a display surface covered with a cotton or wool material which has a transparent glass (not plastic) cover. So far they all doing well, no stains or other damage was found. Just regular good-looking patina. Use natural materials and you will avoid any problems
Silver and gold items remained intact.
So for the last few years I keep my medals on a display surface covered with a cotton or wool material which has a transparent glass (not plastic) cover. So far they all doing well, no stains or other damage was found. Just regular good-looking patina. Use natural materials and you will avoid any problems
