First of all, you need to know:
what sterling silver is?
Sterling silver is an alloy of silver containing 92.5% by weight of silver and 7.5% by weight of other metals, usually copper. The sterling silver standard has a minimum millesimal fineness of 925.(99.9% pure silver, is relatively soft,prone to tarnishing)
So the representative with 925 logo ≈ pure silver.
Since ancient times, silverware can be used as the simplest drug detection tool. For example, people use silver wine cups to test whether wine is poisonous. Because when silver comes into contact with toxins, the surface will quickly turn black, which is easy to be recognized by the naked eye.
Why sterling silver good for belly button piercings?
Low nickel content.
The optimum choice for belly rings, especially for those who suffer piercing allergies due to its low nickel content. Many people think that 925 Silver jewellery is less valuable because it tarnishes. While it is true that it does eventually tarnish, it is also easily restored (unlike cheaper metals). Simply use a silver cloth or silver cleaning agent to polish your belly jewellery - no matter how tarnished it is. Polishing will restore its shiny luster and bring it back every time!
Silver has bactericidal function, so it's best to wear silver piercings when making piercings holes, and use a silver bowl to hold water, which can ensure that the water does not deteriorate. For example, for skin ulcer, silver ion solution can also be used to coat the ulcer, which can kill most bacteria. Silver ion has a strong bactericidal effect and is very good for human body.