1. Tin foil cannot be heated in a microwave oven. Tin foil is metal and has low resistance, and the microwave oven has a reflective effect on metal, so it cannot be put in it.

2. If you put tin foil paper into the microwave oven, it will cause uneven heating and low efficiency of the microwave oven, or cause sparks in the microwave oven, causing danger. In more serious cases, it will damage the magnetron. Therefore Care must be taken when using it.