What's black on top of the burnt pot

The black substances on the surface of the pot after burning are mainly food carbonization residues and metal oxides. The bottom of a burnt pot may contain carbonized proteins, caramelized sugars, and iron oxide produced by the oxidation of the iron pot.

1. Carbonized Organic Compounds

Proteins, starches, and other components in food undergo carbonization reactions at high temperatures, forming black coke like substances. Burning meat produces black carbon particles, while burning vegetables and fruits leaves behind plant fiber carbides. These carbonized substances have stable structures and are difficult to dissolve with ordinary cleaning agents, requiring physical friction to remove them.

2. Metal oxides

Iron pots react with oxygen in a dry burning state to produce black ferric oxide, while stainless steel pots may produce a chromium oxide layer. Aluminum oxide film will form on the surface of aluminum pots, and these metal oxides usually appear gray black. The oxide composition produced by pots made of different materials varies, but they all have high temperature resistance characteristics.

3. Residual edible oil of oil polymer

will undergo polymerization reaction under continuous high temperature, forming a viscous black tar like substance. This type of polymer will firmly adhere to the surface of the pot and may contain harmful substances such as benzo [a] pyrene. Plant oil is more prone to producing dark polymers than animal oil, while low smoke point oils such as olive oil are more likely to form stubborn stains.

4. Seasoning Charcoal

Sugar containing seasonings such as soy sauce and oyster sauce will carbonize into black brown substances after drying, and salt may combine with other components at high temperatures to produce chloride deposits. The organic components in spices will form a black residue with a special odor after carbonization, and these substances often have a pungent odor.

5. Coating decomposition products

The PTFE coating of non stick pans will decompose at temperatures exceeding 260 degrees, releasing fluorinated compounds and forming black powder. The glaze of the enamel pot may crack and peel off at extreme high temperatures, producing black debris. These substances may contain harmful ingredients, and it is not recommended to continue using damaged coated cookware.

It is recommended to soak and soften the burnt cookware first, and use natural cleaning agents such as baking soda and white vinegar in combination with soft cleaning tools. Avoid using steel wire balls to scrape the coated pot. The iron pot can be reheated for maintenance. Daily cooking should pay attention to controlling the heat, cleaning up food residues in a timely manner, and considering replacing severely burnt cookware. Regularly using citric acid or specialized cleaning agents to maintain cookware can extend its service life and reduce the residue of harmful substances.