When cooking in an iron pan, iron ions in the iron pan will be released into the pan with the increase of temperature, but it is generally harmless.

Solution to blackening of iron pan;

1. Wash the newly bought wok with clean water, pour off the water, and then put it on the stove until it is hot.

2. Pour a bowl of vinegar into the pot. When it squeaks, wash it around the pot several times with the kitchen broom, then pour out the vinegar and wash the pot with clear water. Treat the new pot in this way, and the dishes will be delicious and will not turn black.