I have a heat emitter and when I came home from school today, I noticed that there was a blackish brown color on part of it. I put in a loft over the emitter with a screen section to make a hot spot. The heat emitter has a cage around it, so it can't have been him touching it and getting burnt. It's on a thermostat, but was set with the probe underneath it, so it wouldn't ever go off(it's a complex setup). I was thinking that it could be a burn mark from the paint or whatever they put on it. I don't think it was from feces, I checked underneath the heat emitter and there was nothing there. Has anyone ever even heard of this happening before? I appreciate the input.