a method of painting practiced by the ancients, especially the Greeks, in which the colors were mixed with wax and resin and were softened by the aid of fire. Little is definitely known of the process, but the specimens left to us show the wonderful enduring qualities of the colors. The Battle of Marathon, painted by Polygnotus, for instance, was preserved for more than nine hundred years in an open portico at Athens. The art has been revived in modern times, but not to a great extent.