Because of the active chemical properties of silver, silver ornaments without electroplating are more prone to oxidation and blackening.

There may be the following reasons for blackening: First, the wearer's physical condition is poor, and toxins are deposited in the body, which leads to the blackening of silver ornaments.

Second, the contact of silver ornaments with corrosive liquids such as sweat, juice, vinegar and seawater will accelerate oxidation.

Third, the purity of silver ornaments is low.