Posted By:
Frank WakefieldI suggest you NOT insert anything in between the front and back of the slab, so that the card can slide out. Doing that runs the risk of the card getting bent. A low likelihood, but possible.
Lay the slab on a flat hard surface, place a screwdriver along the edge, or a chisel. Tap... and tap your way around until the top and bottom halves separate. Takes a moment longer, but avoids prying and twisting. Having busted bunches of slabs, this works best. I have tried several ways. A near disaster as a screwdriver twisted between the slab halves almost resulted in a bent card for me. Not going to chance that again.