Mr. Hill, whose temperature gauging is remarkably accurate, touched the water and declared that it was 107 degrees, one degree above his favorite soaking temperature.

Hot tubs are also found at natural hot springs; in this case, the water may be dangerously hot and must be combined with cool water for a safe soaking temperature.

Depending on the kiln, the size of the project, the number of layers, the desired finished look, and even the brand of glass, ramp and soak temperatures and times may vary.