Physics
Outside of cooking utensils are generally left black from below because
It is difficult to clean daily.
Black surface is a good conductor of heat.
Black surface is a poor conductor of heat.
Black surface is a good absorber of heat.
Black surface is a good absorber of heat.
The outside surface of a utensil used for heating is coated black so that it may absorb more heat and make heating quicker. This is because black surface is a good absorber of heat.
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