The monk Theophilus describes the process of enamelling in a graphic manner. He directs his workmen to "adapt their pieces of gold in all the settings in which the glass gems are to be placed" (by which we see that he teaches the cloisonne method). "Cut small bands of exceedingly thin gold," he continues, "in which you will bend and fashion whatever work you wish to make in enamel, whether circles, knots, or small flowers, or birds, or animals, or figures." He then admonishes one to solder it with greatest care, two or three times, until all the pieces adhere firmly to the plate. To prepare the powdered glass, Theophilus advises placing a piece of glass in the fire, and, when it has become glowing, "throw it into a copper vessel in which there is water, and it instantly flies into small fragments which you break with a round pestle until quite fine. The next step is to put the powder in its destined cloison, and to place the whole jewel upon a thin piece of iron, over which fits a cover to protect the enamel from the coals, and put it in the most intensely hot part of the fire." Theophilus recommends that this little iron cover be "perforated finely all over so that the holes may be inside flat and wide, and outside finer and rough, in order to stop the cinders if by chance they should fall upon it." This process of firing may have to be repeated several times, until the enamel fills every space evenly. Then follows the tedious task of burnishing; setting the jewel in a strong bit of wax, you are told to rub it on a "smooth hard bone," until it is polished well and evenly. Benvenuto Cellini recommends a little paper sponge to be used in smoothing the face of enamels. "Take a clean nice piece of paper," he writes, "and chew it well between your teeth,--that is, if you have got any--I could not do it, because I've none left!"