Copper ornaments
Make the skin after the reaction of the copper green. We wear the jewelry may not be pure copper, but the copper content of which is enough to react and skin. Especially when some human chemistry (body chemistry) was strong, even more prone to spots.
Sterling silver jewelry
Silver containing 7.5% copper, but most of the Silver jewelery spots caused is black, and all occurred in the black metal and air react. Sterling silver jewelry covered with coating to avoid air oxidation, but the coating fall off gradually over the long-term wear.
Gold jewelry
Gold itself almost will not give you the skin leaving no stain, but other metals mixed in gold. Copper, nickel and silver and gold mixed to change the color tone of the gold, but to make it more rigid, reduce its cost. Any of these metals will leave their mark on your skin.
The smaller the K (Karat) gold jewelry, gold's purity is lower, the higher the content of other metals. Some people wear 10K gold will not be reactive, but some people must buy 18K gold to prevent discoloration.
Nickel allergy
If you are allergic to nickel, then leave it to you is not only a stain so easy to wear jewelry containing nickel will make your skin itching, redness, and even yellow flowing out.
How to avoid jewelry allergy
Gold necklace
Wearing high purity metal jewelry, such as 18K gold. Try to choose platinum jewelry, expensive, but almost does not react with the skin, and are generally not allergic; places in jewelry come into contact with the skin is coated with a layer of transparent nail polish;, if possible, choose stainless steel jewelry; titanium jewelry is not easy and skin reaction, not metal allergy; purchase labels marked "hypoallergenic jewelry specialized build for sensitive skin; keep the skin dry when wearing jewelry; keep jewelry clean to avoid rust
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