The basic component of eggshell is CaCO3, which is about 83-85%, protein 15-17%, and contains trace elements (zinc, copper, manganese, iron, selenium, etc.). The weight of eggshell is about 5.2-5.4g, the thickness is 0.3-0.4mm, and the calcium content of each eggshell is 2-2.5g.

The structure of the eggshell can be divided into five layers from the inside to the outside:

The first layer of the inner membrane of the eggshell;

The second layer of the outer membrane of the eggshell;

The third layer of the papillae conical layer;

The fourth layer of the fenestrated layer;

The fifth layer of the eggshell membrane.

Expanded Information

Beneficial Uses of Eggshells:

1. Soothing Joint Pain

Eggshells contain some nutrients that can promote joint health, such as collagen, chondroitin sulfate, glucosamine and hyaluronic acid.

2. Solve the trouble of barbs

Snap the eggshell membrane face down around the nail cap and fix it for a while until you feel the eggshells drying out before removing it. The hyaluronic acid contained in the eggshell film can help soothe rough skin and keep ingrowns from becoming a nuisance.

3. Remove stains without irritation

When you need to clean, sprinkle eggshell powder on the surface of an object and scrub it clean with a sponge or towel. Eggshell powder can help you take away stains easily while keeping your skin away from harsh chemical cleaners.

4. Help unclog pipes

If your kitchen sink is draining slowly, it's probably because some grease and food crumbs have been deposited inside. Mash the eggshells and put them in the elbow of the sink. When you turn on the faucet, the tiny crushed eggshells will be washed into the pipes with the water, taking away the clogs and keeping the pipes flowing smoothly.

Baidu Encyclopedia - Eggshells

People's Health - Eggshells can be used in this way!