If cooking in an iron pan turns black because the rice is burnt or burnt, don't eat it, because the burnt food contains carcinogens.

If the rice is not burnt, but because of the iron pot, it can be eaten normally.

There are two main reasons for the blackening of general wok cooking:

1, the iron pot is relatively new, and there is a layer of rust on the surface of the pot. Rice will turn black when it is oxidized.

2. After the iron pot is used, there is water residue in the pot, which leads to rust.