Yes, mine are kept in a fire proof safe but interestingly I knew someone who had a collection of Elizabeth 1 sixpences kept in plastic envelopes he hid them in the oven one time when he was going out. Ofcourse u can guess what I am going to say, he forgot and put the oven on, by the time he had realised the envelopes had all melted round the coins and almost encapsulated them all, quick way for Cgs to Slab maybe??? Anyway he eventually was able to remove the plastic after a long arduous task and the coins hadnt been in long enough to damage them, he was lucky that time!!!!