Flashing paint charm

"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."

- Description.

This charm causes paint to flash different colours. It was considered "tricky" for a first year.

Known uses
Hermione Granger used this charm to make the Gryffindor banner flash different colours for the Quidditch match that Gryffindor played against Slytherin in her first year of school.

Possible uses
It may have been this charm which Hermione used to make the various squares on their revision schedules flash different colours as they prepared for O.W.L.s in 1996.

Appearances

 * Harry Potter and the Philosopher's Stone
 * Harry Potter and the Order of the Phoenix