Cast Iron Black Residue. It isnt anything toxic or scary. The black residue on cast iron skillets is not harmful but it can compromise the taste of your food.
That cast iron black residue is basically carbon deposits created from the overheating of oil or fats or bits of burnt food that collect in the pores of the pan and are disturbed during the cooking process. When food is cooked in cast iron skillet people find the cooked food getting a black residue on it. It is just built up carbon from the oils and food youve prepared in your skillet.
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Its just a part of cooking with a cast iron pan. However when you wipe its base you realize an accumulation of black residue on your piece of cloth. I purchased a cast iron frying pan dont yell at me at Wal-mart. The black residue on cast iron skillets is not harmful but it can compromise the taste of your food.