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In page Harry Potter:

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Due to the appeal of the books among an adult audience, Bloomsbury commissioned a second line of editions in an 'adult' style. These initially used black-and-white photographic art for the covers showing objects from the books (including a very American Hogwarts Express) without depicting people, but later shifted to partial colourisation with a picture of Slytherin's locket on the cover of the final book.[citation needed]