50+ Why Does Copper Turn Black. You said you had put water in copper vessel overnight, and it turned black downside. The copper metal turns black when it is heated in the burner.
You said you had put water in copper vessel overnight, and it turned black downside.
I turned the iron on and waited for it to heat up, and immediately the tip turned black. Copper doesn't turn green overnight, it transitions through a number of stages over the years. This coating does not affect the quality of the pot in any way and can be cleaned easily. This is due to a chemical.