|"Are you a wizard or not?"
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- "As a surprise for Harry, they had painted a large banner on one of the sheets Scabbers had ruined. It said 'Potter for President', and Dean, who was good at drawing, had done a large Gryffindor lion underneath. Then Hermione had performed a tricky little charm so that the paint flashed different colours."
This charm causes paint to flash different colours. It was considered "tricky" for a first year.