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Message:: [QUOTE="GSDykes, post: 2187292, member: 73321"]I searched the forums and could not find adequate information on this, so I post this. I recently purchased what should have been a great coin. I always remove them from their old 2x2 cardboard holders (this is about such coins and holders, not slabs), and put them into a new cardboard holder. I took it out only to find it was covered with a PVC type residue, you know the milky cloudy stuff. It was/is practically impossible to completely remove. (maybe months in acetone). I have used "SuperSafe" holders and am quite happy with them. Never had a problem with them. Their little windows are some sort of a crisp Mylar. Never seen residue in any Supersafe held coins. But the holder which left the PVC murky mess, was a "Lighthouse". Lighthouse holders have a diamond like trademark on the little tab. Supersafe's have a crown. I just bought some Lighthouse 2x2's and upon inspecting the little window material, it does not seem as "hard" or crisp as the Supersafe windows. It is a softer window, like a thin baggy like plastic. Are the older Lighthouse 2x2's different from their current issues? Does anyone know what material the lighthouse windows are made of? Has anyone long term experience in comparing various 2x2 holders?? Does anyone have a favorite, and if so why?[/QUOTE]