"The earliest form of painting was with colours ground in water. Egyptian artists three thousand years B. C. used this method, and various mediums, such as wax and mastic, were added as a fixative. It was what is now known as tempera painting. The Greeks acquired their knowledge of the art from the Egyptians, and later the Romans dispersed it throughout Europe. They probably introduced tempera painting into this country for decoration of the walls of their houses. The English monks visited the Continent and learnt the art of miniature painting for illuminating their manuscripts by the same process. Owing to opaque white being mixed with the colours the term of painting in body-colour came in use. Painting in this manner was employed by artists throughout Europe in making sketches for their oil paintings."