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In page Dianthus caryophyllus:

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At the University of Oxford, carnations are traditionally worn to all examinations; white for the first exam, pink for exams in between, and red for the last exam. One story explaining this tradition relates that initially a white carnation was kept in a red inkpot between exams, so by the last exam it was fully red; the story is thought to originate in the late 1990s.[citation needed]