2 x 2 paper with the clear center are supposedly acid free and I have never seen any color come off.I get them at the coin show so they were made for coins but use them for my chips,then I put those into my pages that hold them,you can see on my page of the day pictures and you can write on them. I suggest also you don't leave your binders laying flat as the other chips will stack against them and possible warpage.Stand the binders upward like they were designed to be.You can get the stuff from C T Rogers family members, not sure the address but can ask the board for their address, pages and 2x2 paper flips to go into binders.From what the other people on the board have shown I think you better get them out as soon as possible before you damage your chips. I've never used them so I don't know what they can do but I think I do know.Torrey