I do not think that card will soak well. I think the top surface layer of smooth finished paper will release from the coarse inner paper.
As for what's going on with that darkness that appeared on the right side... I think something at some point in time soaked into the card, and then was wiped off of the surface. The soaking has brought some of whatever it was (coffee, cola?) back to the surface.
I wish you well with it.
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