That looks like hydrogen peroxide or OxiClean was on the card. I've encountered a couple of cards that ever so faintly smelled of bleach. If you're just dying to know, put the card in a glass of water, let soak an hour or so, then put a piece of red litmus paper in there. If that turns blue then bleach might be a good guess as to what caused that. Maybe someone has done that thinking of giving the player the wings of an angel, in hopes of selling the card at a premium...
I'm not a fan of trimming card edges, I don't think anyone really is. I'm not a fan of bleaching cards. I am good with soaking a card in water. And if a speck of tobacco is on a Polar Bear card, I don't consider soaking and removing that speck as card alteration.
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