Holofoil

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Holofoil, short for holographic foil, is another word for "shiny" when used to refer to trading cards or comic book covers.

Holofoils in trading cards are often seen 'bent'; when put on a flat surface, instead of lying flat, they will bulge in the middle. This is due to the cardboard side absorbing more moisture than the foil side in humid conditions. It can be prevented by using card sleeves.