I put this in the oven and the temp would not go over 300 C.
Smoke was billowing out and I was turning up the knob for more
heat. Nothing. Could not get it to go over 300C. Then I tapped
the meter and bang the needle jumped up to 900 C! Opps.

I quickly shut it off and opened the door. The ceramic liner was 
bright red. I quickly pulled the can out. This is the result. The 
turbine oil vaporized of course and the tin plating melted off 
the steel can. That is probably tin oxide you are looking at.

Paul Lamar
 
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