Hi everybody i am the thread starter , please help llook at this wok. I am not sure if it's Aluminium or Stainless steel. The fact is - it develops black stain like the photo VERY VERY EASILY. I intended to fry an egg with sunny side up , immediately after I throw the egg into the wok it builds up the black stain VERY QUICKLY!!!!! I am very frustrated.... I still remember I could fry a lot of things without building up any stain. I only put the food onto the wok when the wok and oil is hot enough which could even give fumes.