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harry potter - Do Disillusionment Charms Fail At Very Close Range?


I've been informed by those who know much more about Harry Potter than I that Hogwarts is protected with a Disillusionment Charm so all muggles will see is ruins with a "Danger: Keep out!" sign around them. (Apparently this was in one of the first three books, but I'm not sure where it was.)


My first thought was, "Well, a danger sign would encourage some muggles to investigate!" Which leads to what I think is an obvious question: Will a disillusionment charm on a place like that still work when a person is real close to the location? Will it work from inside the location?


For example, if a curious muggle made it to the gates of Hogwarts and started walking around inside, would they still see it as abandon and in ruins, or once they entered, would they see it as it is?



Answer




‘It’s bewitched,’ said Hermione. ‘If a Muggle looks at it, all they see is a mouldering old ruin with a sign over the entrance saying DANGER, DO NOT ENTER, UNSAFE.’

‘So Durmstrang’ll just look like a ruin to an outsider, too?’

‘Maybe,’ said Hermione, shrugging, ‘or it might have Muggle-Repelling Charms on it, like the World Cup Stadium. And to keep foreign wizards from finding it, they’ll have made it Unplottable –’

‘Come again?’

‘Well, you can enchant a building so it’s impossible to plot on a map, can’t you?’

‘Er ... if you say so,’ said Harry.

Goblet of Fire - Page 148 - UK Hardcover



I think that Muggle-Repelling charms make the most sense. The trio uses them to protect themselves while they're on the run in Deathly Hallows, as well. "Salvio Hexia... Protego Totalum... Repello Muggletum... Muffliato..."


In general, I don't think there is a specific distance at which Disillusionment Charms fail, but a witch or wizard could use Homenum Revelio to see if there are people around who are under a Disillusionment Charm (which is the charm used by Dumbledore to become invisible) I believe Hogsmeade is one of the few all-wizarding towns and it's near Hogwarts; I doubt a lot of Muggles are in the vicinity of Hogwarts to begin with. But I'm guessing that any Muggle who finds their way to Hogwarts would not be able to approach it.



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