Book/Movie 2. Polyjoice Potion also plays an important role in book/movie 4 and 7.
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In Harry Potter and the Chamber of Secrets, Harry, Ron, and Hermione use the Polyjuice potion in order to appear as Vincent Crabbe and Gregory Goyle so that they could infiltrate the Slytherin common room and talk to Draco Malfoy. Hermione has accidentally used the hair of a cat instead of Milicent Bulstrode.
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Harry Potter attempted to use crucio on Bellatrix Lastrange and later used it on Amycus Carrow.
Blue and black mainly.
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