Why the bottom of cooking utensils are blackened and the upper part is shining?

The bottom of cooking utensils is often blackened due to exposure to high heat and soot from cooking flames, especially when used on gas stoves. This results in the accumulation of carbon deposits and grease, which can create a charred appearance. In contrast, the upper part remains shiny because it is less exposed to direct heat and splatters, allowing for less wear and easier cleaning. Additionally, the materials used for the upper part may be designed to resist staining and maintain a polished finish.