What is the black coating on the back of a throttle body?

I cleaned the throttle body of my car with carb cleaner not knowing the adverse effects it would have on the black coating on the back of the throttle body. I want to replace the black coating so my car will idle correctly. Does anyone know what that coating is made out of?





Thanks!|||are you talking about the plate thats in side of the throttle body, the one that opens up to let air into your engine? if so then that black stuff is carbon build up and should be cleaned off. but i dont know if i would have used carb cleaner down that far, chances are you got some of the cleaner down in the engine and its trying to burn it off, which is normal. just let it run for a bit.also it might blow some smoke, which would be ok.