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A Chemist i brought some storage off recently said that for the domestic user its not too much of a problem, but when you look at a museum like the british natural history museum, which is several hunderd times the size of the average domestic collection (at least) with a moth ball or two in each drawer you have a lot of exposure, that said, even a modest collection gives off quite a smell, i've noticed a distict lack of carpet beetles in the room i house my collection!