925 sterling silver jewelry natural black is a normal phenomenon, because there are some corrosion of air and other natural media sulfur and oxides of silver, after wearing a period of time, there will be some small spots (silver sulfide film), a long time will spread into a film, or even turn black so, now 925 sterling silver jewelry have some discoloration due to oxidation and the following is the recommended maintenance: Do not wear jewelry while wearing other precious metals 925 sterling silver jewelry, in order to avoid collision deformation or abrasion. 925 sterling silver jewelry to avoid contact with water vapor and chemicals, avoid wearing a swim, especially to the sea every day after wearing it finished 925 sterling silver jewelry with a clean cotton cloth, jewelry box or bag sealed .925 sterling silver jewelry has black oxide, you can stick with a soft hair brush scrub toothpaste, may also be hand-rubbing soap or detergent to clean way: it can not deal with clean water before scrubbing with a wash of silver, 925 sterling silver jewelry have to use cotton cloth after washing dry.
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