Why does silver jewelry turn black

1.Because of each person's endocrine and physical situation is different,some people sweat more acid and some are less,some people's
body fluids in relatively high sulfur content,which are the reason lead silver jewelry surface black,so everyone wearing the silver
will be have the different results,some people will wear bright as new.

2.Air and other substances,such as the sulfur of eggs and cosmetics ,nitric acid and oxides of silver all have a certain amount of
corrosion.To wear silver jewelry too long,combination of sulfur and silver jewelry to silver will be formed on the surface layer of
black sterling silver jewelry sulfide film,begins as a few small spots and diffused into the film,to form generally known as the
silver scale,change as black,affect the surface gloss of silver jewelry,it is often mistaken of fade.

Because of these natural properties of handmade silver jewelry,silver has good health effects,and often wear can neutralization the
body of toxic substances of people.Silver ion has a strong bactericidal effect, can be eliminated 650 kinds of bacteria,as drug
testing tools,very good to humans' body.And it can also accelerate wound healing, prevent infection,and to purify water and the role
of preservation.