A glaze for terra-cotta tiles requiring only a moderate heat can be made from a solution of sugar of lead in hot water. Cover the tiles with the solution and expose to a clear red heat. A coke fire would probably be suitable, provided it does not touch the tiles in any way. A sagger, or receptacle, to hold the tiles may be made from a drain pipe. Limewash the inside of the pipe and set the tiles with the glazed surfaces facing each other. Try immersing them in salt or borax, and then lake or paint over with red-lead; this will give a deep red glaze.