Khác biệt giữa bản sửa đổi của “Muggles' Guide to Harry Potter/Magic/Polyjuice Potion”

'''''Polyjuice Potion''''' allows the taker to assume the physical appearance of another person. The potion takes a month to brew, and must include part of the person you wish to look like, and can last anywhere from ten minutes to twelve hours, depending on how well it had been brewed.

It must be extremely useful to appear to be someone else. The potion is remarkably comprehensive in its actions; the false Moody, transformed by the potion, is missing an eye and a leg, and these grow back when he is deprived of the potion. In fact, one assumes they must grow back each night, as the effects of the potion last only an hour. One must question whether the suppressed limb must be exercised to avoid it atrophying... did the false Moody have to exercise each day in his normal shape to avoid the effects of nine months without moving the suppressed leg?

One wonders what happened when Crabbe or Goyle, standing guard duty, ran out of time? They did not seem to have any additional potion with them, and it is certain that a 6th-year Crabbe or Goyle would not have fit into the robes of the students they chose to disguise themselves as, which were typically first- to third-year girls. Possibly they had additional stock of prepared potion with them, but we never see them drinking any of it. However, throughout the seventh book, the effects of the potion seem to wear off at much more convenient times than we would expect; rather than a fixed hour in duration, for instance, Harry's disguise as "Barny" seems to last for the duration of the wedding, and Harry, Ron, and Hermione's disguises as they invade the Ministry not only seem to remain in place for the entire time that they are in the Ministry, but seem to wear off very conveniently just as they leave [[Muggles' Guide to Harry Potter/Places/Grimmauld Place|Grimmauld Place]] for the forest where the [[Muggles' Guide to Harry Potter/Major Events/Quidditch World Cup|Quidditch World Cup]] had been played two years before. This convenient duration of the potion effects seems to be one of a number of places where the author is altering the magic she has created in order to make a better story.