Empathetic Response: It's really frustrating when a newly polished pressure cooker turns black again after only a few days of use; all the effort seems wasted.
Core Conclusion: With proper maintenance, a polished pressure cooker can remain relatively black for several months to a year. However, prolonged high-temperature dry heating, improper cleaning, or use of hard tools can cause it to darken again or develop localized carbonization within a few weeks.
Key factors affecting the speed of re-blackening are as follows:
Usage Habits: Frequent high-heat dry heating, excessively high oil temperatures (smoking), or cooking acidic foods (such as tomatoes or vinegar) accelerate oxidation and coating aging, especially for non-stick cookware, which is more prone to black marks.
Cleaning Methods: Using steel wool, strong alkaline detergents, or failing to promptly remove residue can damage the protective surface layer, causing the metal to oxidize and blacken more quickly. Pot Material:
Stainless Steel Inner Pot: Highly durable; turns black slowly under normal maintenance, mainly due to high-temperature oxidation or limescale buildup.
Non-stick Coated Pot: Once the coating peels slightly, the exposed aluminum underneath oxidizes and turns black easily, and is difficult to remove completely.
Storage Environment: Humidity, stacking, friction, or contact with corrosive substances will shorten the time the pot retains its shine.
Recommendations for Extending the Shine Period:
Control the heat when cooking; avoid oil smoking or dry-heating for more than 2 minutes.
Wash immediately with warm water and a soft cloth after use; boil in baking soda water once a week to prevent limescale buildup.
Keep dry when storing; place kitchen paper between pots to prevent friction.
If you find that the pot quickly turns black after each use, it may be due to uneven heat (such as flame overflowing from the gas stove and burning the pot's surface) or damage to the bottom of the pot. It is recommended to check the compatibility with your stove.