What techniques did Raphael use?

Raphael's most notable work is probably the four frescoes he did during the renaissance period. When he moved to Rome he was almost immediately commissioned by Pope Julius ll, who asked him to fresco a room which was to become the pope's private library. This room, as well as three more, became famous as the "Raphael Rooms," and include the most famous fresco of the High Renaissance, 'the school of Athens' and 'the Pamassus'. A fresco is using wet plaster and colour pigment to create a 3D piece sticking out from a flat wall or surface.