The disadvantage of Meilong Meili black crystal wok is that it is heavy and easy to rust. Too much rust absorbed by the human body will cause dizziness and nausea, and too much intake is harmful to the liver. Therefore, it is not advisable to use an iron pot to hold food overnight, and try not to use an iron pot to make soup, so as to avoid the oil layer on the surface of the iron pot disappearing and rusting. When washing, avoid using hard brush cloth to brush hard, and use detergent as little as possible to prevent scratching the pot. Wash and dry the pan immediately after use to avoid rusting.