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Message:: [QUOTE="Just Carl, post: 565986, member: 4552"]Way, way back when I was a kid I was always interested in Chemistry. Made my own fireworks by the age of ten. Even back then I knew that toning, tarnishing, corroding, rusting of metals was either caused by an Oxydation process, moisture attacks or other gasses combining to form such compounds. Became a Chem teacher in college due to coins probably. Way back I too used those horrible Whitman Folders, albums not invented yet. So all went into plastic bags with the air pushed out. Eventually Whitman and others started making Albums so I moved all coins into those and still put in plastic bags with all the air pushed out. Then one day, just to help me I suppose, The S.C.Johnson & Sons company came out with those Zip Lock plastic bags which are really fairly good at keeping air out. So now with well over 100 Whitman Albums and all in Zip Lock plastic bags, they will be OK for several million years. Slight exageration you know. I don't use air tights, humidity gel packs, fire resistant safe, etc. Just those Zip Lock bags made for my coin albums. All my coins from as far back as the 40's still look as if they were just put there yesterday. Many of my large quantities of coins are also in those plastic rolls sealed with tape at the top. 30 to 40 rolls of 1943 Steel Cents from my Dad as an example. Not sure since I haven't counted them for probably 30 or more years.[/QUOTE]