1. Eggshells fired into ash powder are good degreasing materials. Laundry ball, spittoon, etc. You can wipe it with it.

2. Eggshell contains 80% calcium. Cleaning, baking with slow fire, grinding, and mixing with rice to make fortified rice rich in calcium.

3. Raising chickens and ducks can improve the egg production rate.

4. Wash the eggshell with clear water and soak it in vinegar. After a few days, the eggshell softens and dissolves. Used as normal household vinegar, such as stir-frying, cold salad and eating jiaozi. It is the most effective, economical and convenient method to supplement calcium.