I bought a 55 Topps Clemente a couple years ago that had a weird, wavy warp in the cardboard. There was not any glue or anything stuck to the back of the card. It almost looked like it got wet at some point years ago, like maybe in an old shoebox of cards in a basement (that's how I envisioned it) and then dried funky.
I hadn't soaked any of the 50's topps cards before, so I tried a common 55T 'beater'. It survived the process, so I gave Roberto a bath for 15-20 minutes and it dried perfect, without any of the warping problems it previously had. It now resides in a PSA 4.5 holder and looks great.
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