Earlier this week in my intermediate ceramics class at our local community college we were given several different types of materials to wedge into our clay and then asked build something we would bisque fire when dry. The point I believe was to see what textures would evolve. Well, I chose a small package of nylon buttons (and the instructor chose small plastic toy soldiers.) As a retired fire marshal I became concerned about the off-gassing of the buttons/soldiers when fired in the kiln. Would anyone know the consequences of the hydrogen cyanide off-gassed during the firing (which would be done in a well-ventilated area with no students present?) How would it affect the fire brick and electrical elements in an electric kiln. Thank you in advance for your expertise. Steve F.