i plan to try them some time. the natural ingredient baking soda works in a similar way. however, details regarding exactly who that applies to and how much they would be able to claim is still a long way off. at least two other people were not too far away, doing who knew what in these stacks, but nobody was near enough to see him. perfect for storage and transport, this is also going to be great for a display case when you travel to card shows and you want others to admire your collection. and that is all the thanks they got. 