The main components of pearls are calcium carbonate and water (about 90% calcium carbonate and 4% water). Calcium carbonate, which accounts for the bulk, mainly exists in the form of aragonite. However, this substance is unstable and easily oxidizes with air, resulting in the appearance of pearls changing from smooth white to dull yellow.

Improvement measures:

1, dilute hydrochloric acid immersion method

Soak pearls in 1%-5% dilute hydrochloric acid or hydrogen peroxide solution. With the generation of foam, the yellow shell on the pearl surface gradually dissolves, so the pearl is like a reborn, from yellow to white. However, pay special attention. Never soak in dilute hydrochloric acid or hydrogen peroxide for too long, otherwise it will do great harm to pearls.

2. Pearl stripping method

Is to peel off the outermost layer of pearl yellow and expose the complete inner layer. However, the peeled pearls will become smaller.

Extended data

Measures to prevent pearls from yellowing;

1. In order to keep the luster and color of pearls unaffected, pearls should avoid contact with acids, alkalis and chemicals, such as perfume, soap and styling water. Don't wear pearl jewelry when swimming or bathing. So please put on your lovely pearls after makeup.

2. There are tiny pores on the pearl surface, which is not suitable for it to inhale dirty substances in the air. Pearl absorbs hair gel, perfume and other substances. So don't wear beautiful pearls to send electricity. Be careful in the kitchen. Don't wear beautiful pearls when cooking. Steam and oil fume may penetrate into pearls and turn them yellow.

Every time you wear pearls (especially in hot weather), you must clean them and put them away, so as to keep them shiny. It is best to use sheepskin or delicate flannel instead of paper towels, because the friction of some paper towels will wear pearls.

4. Don't wash the pearl necklace with water. Water can enter the pores of beads, which is not only difficult to dry, but also may ferment inside, and the beads may turn green. If you sweat a lot when wearing it, you can wipe it carefully with a soft wet towel and put it back in the jewelry box after drying it naturally.

5. Don't put pearls in the safe for a long time, and don't seal them with plastic bags. Pearls need fresh air, so they should be taken out and worn every few months to let them breathe. If pearls are kept in a box for a long time, they will turn yellow easily.

The more pearls are worn, the uglier they are, and they are easy to yellow and peel! Did you buy a fake? Actually.