You're going to cast the ward again. Then you'll take the skin from the jar, and try to pull it through. If the ward is working, it'll resist.

[ Warning done, he proceeds to do this. Alucard's hands open the jar and take the skin from it, pinching it between fingers. Then he tries to move that hand through the shimmering air. There's resistance. He pulls harder. There's a hissing sound, the magic being pushed back bit by bit, allowing the skin to be pulled forward. And then it tears, a little scrap of it left between Alucard's fingers and the rest floating to the ground. ]

Seems to work. Hopefully it'll hold against the real thing.