http://www.helium.com/items/597008-why-do-some-jewelry-metals-turn-skin-green
Silver in the fine powder form is black, that is happening on slight friction of silver metal, which is soft
Yes, sterling silver can sometimes cause a green ring when it oxidizes from exposure to moisture, air, or certain chemicals. This green discoloration is a reaction between the silver and substances on the skin, such as sweat or lotions. It is a temporary and harmless occurrence.
True sterling silver will not leave green marks on your finger. Sterling from North America is fine silver ( .999 pure) a .925 % and copper makes of the rest of the alloy. Other locations will ofter mix fine silver with nickel. I assume whatever metal your ring is made of it oxidizing and the oxidation is rubbing off onto your skin causing a green mark to show.
Sterling silver tarnishes because when silver is exposed the air it causes chemical reactions and creates Silver Nitrate. This is what will leave black marks on your skin when you wear something made of silver.
It is the nickel in some silver jewelry that reacts with your body chemistry to turn your skin and the jewelry black. .925 Sterling Silver, such as that offered by Tiffany and Silpada, contains no nickel. .925 sterling silver is 92.5 pure silver, with only 6.5% copper added for stablity.
Sterling silver tarnishes due to a chemical reaction with sulfur compounds in the air, which forms silver sulfide on its surface. This process is accelerated by factors such as humidity, skin oils, and exposure to certain substances like perfumes and lotions. Regular cleaning and proper storage can help prevent tarnishing.
If you have sensitive skin you might want to go with silver but if you dont and want to go with whats cheaper sterling silver is what you should choose.
The acidity in skin has tendency to cause silver to turn black or green. This is a corrosive agent that can be cleaned with a quality silver cleaner.
Gold-tone over base metal is not the same as gold. Silver-tone over base metal is not the same thing as silver. Many base metals are used to make jewelry, and they are often coated with paint to make it look like gold or silver, but once the paint wears off, the metal can react with the skin and turn it green. This is especially true of jewelry that is made of copper and then coated with paint. Copper reacts to the sweat in a person's skin, and turns green. Gold-filled and gold-plated jewelry may also have certain base metals that react with a person's skin. The same is true of silver-plated and silver-filled. Sterling silver, Bali silver and such are not reactive and should not turn the skin green. Gold should not turn the skin green. Electroplate is another way of fusing gold or silver to base metal, and it is very durable, but if the plating ever cracks, the base metal could be reactive with the skin. The way to avoid purchasing something that will turn your skin green is to check for the tiny stamp imprinted on gold (it will tell how many carats of gold the jewelry is made of) and sterling silver (it will say sterling, and perhaps be accompanied by some numbers).
Fake metal can turn your skin green this applis to gold and silver.
it means the "silver" isn't actually silver. the green stuff is a reaction sort of between your skin and the fake silver. this will wash of eventually. it means your allergic to it.