Medal Rust

in General Chat
I keep my medals in a small, dry box under the bed.
A few months ago i noticed what could be described generally as a sort of rust appearing on them.
Not the usual orangey/red rust you have on a car or what not but in some cases a greeny/yellow substance around them. In some cases it's a few black spots.
I've separated them from the others as i think it may have been spreading!
Has anyone else had this? Any solutions?
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Comments
Greenly/yellow is probably the result of the salts from your sweat reacting with copper in your medal. Clean it off, give the medal a rinse, dry carefully and gloat in private.
PS it shouldn't be "catching" unless next to a medal of the same material or sweaty conditions continue.
Thanks!
Thought they may be rotting away leaving me with only the medal ribbon