The metal necklace turns black because it reacts with oxygen in the air for a long time and is oxidized. The oxides are all black. In order to enhance the effect, toothpaste will put in fluorine-containing substances, which contain a lot of acidic components, and will react with those oxides to remove the black oxides produced by oxidation reaction, thus restoring the brightness of metal ornaments.

1, squeeze toothpaste on a towel or a soft toothbrush, and pay attention to using soft tools.

2. Brush the metal necklace with a toothbrush or soft cloth to remove fine lines and dirt on the surface, but pay attention to the abrasive particles in the toothpaste. Don't use too much, just don't use too much force.

3. Rinse with clear water to remove all foam in toothpaste and prevent residue.

4. Let the gold jewelry glow again.