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After the wedding, Hermione has to use a memory charm on two Death Eaters, where she states that she has never done it before, but she knows the theory. However, she states that before she left on her adventure, she made her parents forget her, and move to Australia. Is this a contradiction, or is there an explanation?

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Maybe she made herself forget casting the memory charm, after informing the others that she had done so? Perhaps she feared that, if she were captured, the memory charm could be reversed unless she made herself forget capturing it. –  Jeff Jul 26 '11 at 20:48
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Perhaps, misusing the memory charm on her parents, it partially backfired causing her to forget the fact that she cast it previously. Or perhaps Rowling overlooked it. :P –  Neil Jul 27 '11 at 9:13
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I don't believe it's directly addressed in the stories, but Hermione indicates things about her parent's substitute life, such as the fact that they don't have a daughter; this suggests that she didn't use the 'Obliviate' charm, but something more complicated. Obliviate COULD remove the knowledge of them having a daughter.. but at the expense of the last 17 or so years of their memory, from how it's shown being used. (Or, possibly, just the 'event' of her birth/life/etc, but that would still leave too many loose ends.) This is far from the first time we've seen her use a spell that hadn't been specifically 'taught.'

So this could be the first time she used that specific memory charm; that being one that simply wipes memory of a certain time period or event.

Also, she later says "I’ll find Mum and Dad and lift the enchantment."; but Obliviate appears to erase memories, not simply hold them suppressed, so what would there be to lift?

That's trying to stick to the story; what I suspect happened in JK Rowling did some re-writes or editing, and missed that :)

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Obliviate is not the only "memory charm"; Hermione simply used a different one than the memory-erasing Obliviation Charm. Slughorn didn't Obliviate his memory of Tom Riddle asking about Horcruxes, he simply changed the version that would be easiest to retrieve magically. He always had access to the real one. Also, even if a memory is Obliviated, it's apparently possible to re-retrieve it; Voldemort tortured Bertha Jorkins until he broke through the obliviation charm Crouch put on her. Of course her mind was broken after that happened, but still... –  KeithS Oct 20 '11 at 1:25
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Right; that's what I was getting at.. Her comment about not having done it before was after using Obliviate; she had never used that one before, but had used some OTHER memory charm, as witnessed by her parents... She could have said 'Well, I've never used that specific memory charm before, although I have modified memories, such as with my parents, but having never used this specific one, and only knowing the theory, I wasn't sure how it would work.' Which would not be out of character for her.. but would have been a little wordy given the situation. :) –  KHW Oct 20 '11 at 4:50
    
@KeithS are you certain Bertha Jorkins was under an obliviate charm? Could that also have been some other charm? I don't remember this. btw another example of someone who has suffered the debilitating consequences of "obliviate" is Prof Lockhart who is still confused and at St. Mungos when they are there for Arthur. –  balanced mama Dec 8 '13 at 18:43
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To quote from a webchat from JK Rowling shortly after the release.

Laura Trego: Did hermione really put a memory charm on her parents she says she did but then about 50 pages later tells ron shes never done a memory charm

J.K. Rowling: They are two different charms. She has not wiped her parents’ memories (as she later does to Dolohov and Rowle); she has bewitched them to make them believe that they are different people.

So, it looks like the movie's use of obliviate was wrong, but the book was right. They just were two different charms, although related, different. That might also explain why it was possible to reverse the charm on her parents.

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I like you're doing this, blog-like posting :) Keep it up! –  genesis Oct 8 '11 at 11:08
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Hermione used a Confundus charm on her parents, and bewitched them to think they were different people. She never used the Obliviate (memory) charm before using them on the Death Eaters.

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Is that the same spell as the one Ron used to pass his driver's licence exam? –  b_jonas Sep 4 '13 at 8:40
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She modified her parents' memories rather than erasing them. The Memory Charm erases memories, which Hermione had never done. In the movie, she used Obliviate both times, but she also never claimed to not have done that charm before (I think).

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The charm depicted in the movie erased Hermione from all aspects of her parents memory, home, belongings, photos and so was not acting as an Obliviate or Confundus. I'ld call it Obscuriate eradictus, were I to put a functional name to it based on the results depicted.

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