When ordinary jewelry turns black, you can brush the blackened part with toothpaste, or soak the jewelry with developing powder and water. If the jewelry is black due to corrosion, send the jewelry to a gold and silver shop for professional cleaning and electroplating, and re-plate the surface of the jewelry with a layer of gold.

Toothpaste Prepare an abandoned toothbrush, dip it in some water, squeeze it into toothpaste, and slowly brush the black part until it is clean. In the process of brushing, you must take your time to avoid damaging the jewelry because of haste. After brushing your teeth, rinse the ornaments with clear water and dry the water stains.

Developing Powder Prepare a bag of developing powder and a big bowl of clear water, pour the developing powder into water and stir evenly, then soak the blackened ornaments in water for about 5~ 15 minutes. It's time to take out the jewelry, rinse it with clear water and dry it with cotton cloth to restore its luster.

Electroplating If the black stain on the jewelry surface can't be removed anyway, send it to a jewelry store or a gold and silver store for professional cleaning and electroplating, and re-plate the jewelry surface with a layer of gold. This method is mainly used in the case of jewelry corrosion and blackening.