Golpalott's Third Law is a law for making antidotes, which appears to say that the antidote for a blended poison — that is, a poison created by mixing several other poisons together — cannot simply be created by finding the antidotes to each separate poison in the blended whole and mixing them together. Instead, as Professor Slughorn explained, the potionmaker must find that single ingredient which, when added to the blended antidotes, transforms them near-alchemically into a combined whole which will counteract the entire blended poison. Simply put, according to this law, a true antidote to a blended poison is more than the sum of its parts. The book Advanced Potion-Making contains this law, but does not explain it. It is likely that this law is correct for just some poisons, as Professor