It's too bad we don't know anything about what magic *is*. We know it's innate -- a Muggle can't just pick up a wand and do it, nor can he see magical beings or magically shielded places. I think Potions are tied to inherent magic in the same way those things are. Otherwise, wouldn't Muggles have figured out how to make them all a long time ago? Wouldn't they be just part of science?

I'll grant you that the type of magic that casts a Charm and the type of magic that serves as catalyst for a Potion may work differently, but you're basically saying that the resurrection of Voldemort wasn't magic, and I can't agree with that.