Salt turns yellow and cannot be eaten under normal circumstances. Normal salt is white, but chemical reactions may occur after discoloration.

If the salt changes color, it is recommended not to eat it, because it may contain harmful chemicals, such as iodine. When the salt reacts with the elements in the air, the iodine agent may be transformed, leading to the precipitation of free iodine, which is yellow. In addition, the color of red salt and yellow salt left in the air for a long time may gradually disappear, but it is best not to eat them.

Therefore, it is recommended to use a well-sealed container to store salt to avoid reacting with elements in the air.