2. Low silver content. Generally, the lower the silver content, the more other metals are doped, and the easier it is to blacken or oxidize.
Silver is the most ideal metal ornament. It has amazing sterilization ability. Wearing it not only plays a decorative role, but also plays a certain role in preventing bacteria and sterilization. When washing and showering, ornaments are often soaked in water, although the amount of silver dissolved in water is very small. For example, a silver spoon will not lose more than one milligram even if it is washed with water for 10 million times. Only a little silver dissolved in water becomes active silver ions, which can kill bacteria.
The bactericidal power of silver ions is so strong that only 2% of silver ions in every liter of water is enough to kill bacteria. The bactericidal ability of silver ions is usually more than three times that of mercury and more than 1000 times that of phenol. The chemical properties of gold and platinum are more stable than that of silver, which is ideal from the point of view of constant quality of jewelry, but they are basically inactive and do not have the characteristics of silver jewelry.