This is slightly off topic but I just had to say something about Moloch's post. That is the best definition of black magic I've ever heard. Magic should be helpful for the practitioner (good/white magic) so it follows that magic which has a negative affect on the practitioner would be black. Even if, as I do, you believe there is no truly black/white magic simply the intention behind it, this is a great way to explain to the lay man the diffrence.