The most famous of these paintings was done between 1472 and 1475. It is a "Baptism of Christ". Giorgio Vasari writing in his book "Lives of the Great Artists" says that the angel on the left was painted by Leonardo da Vinci. Vasari says that when Verrocchio saw how beautifully the eighteen-year-old apprentice could paint, he put down his brush and never painted again. On close examination, it can be seen that most of the painting is painted in old-fashioned tempera, but the angel, parts of Jesus' body, and the background landscape have been painted in the new technique of oil painting. This makes art historians think that Leonardo worked on many parts of this picture. It has also been suggested that Botticelli painted the second angel.