No
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You have them too low in the oven or the temp too high.
It's hotter at the bottom because that is where the heat tubes are.
At the bottom.
Loss of paint in the cavity (the cooking area) of a microwave oven isn't a safety problem unless that spot is rusting and has rusted through. That will leave a hole in the cavity, and that is a safety problem.
the bottom of the oven.
Answer: No! Do NOT put aluminum foil in the bottom of an oven, I did that and it ended up melting and baking on the bottom of the oven and it's almost impossible to get it off.
I usually do it on the middle one and the cake comes out fantastic!
The bottom rack of the oven is the hottest in most electric and gas ovens. With that said, if you have an in oven broiler then you would use the top or middle racks for the hottest spot in the oven.
It's at the bottom of the sea and is made of iron, so it's a good guess that it rusted long ago.
The reason you can put food on the bottom of the oven is because not the whole area of the food will be cooked with meat you will get food poisoning. You can put plates on very bottom just to heat up though