So I'm watching Harry Potter and wondering about potions. Are they really magic? I mean, from everything I've read in the books they just seem like an obscure branch of Chemistry. They don't seem to require any particular use of magic on the part of the person preparing them. If a muggle had a book and the right ingredients is there anything to stop them from brewing up a potion?
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"And why, Mr. Potter, can you not merely conjure a potion into existence? Or transfigure one potion into another?"
"Ummm..."
"As I thought." Snape wheeled on him. "Because it is the process that is magic."
Okay, no great prose there, but I think that's why potions cannot be made by muggles -- if the could, they could be conjured.