Hi, So I have some 50% Florins that are looking pretty shabby (to be clear this I how I got them). See pic below. A couple questions: 1) Should I do anything about this? Will leaving them as is further damage the coins? 2)Will storing these with non damaged coins do anything to the non damaged coins? 3)What causes this? I assume this was caused by moisture? 4) What exactly can be done to "fix" them? Cheers!