Gold and Precious Metals

What metal has green tarnish as it ages Silver or other?

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2011-03-07 00:41:37
2011-03-07 00:41:37

Pennies and the Statue of Liberty are both made of copper but the Statue of Liberty is now green just like pennies become, although they are shiny when they're new. So copper is the metal that has green tarnish.

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exposure to substances which react with the surface of the metal, usually sulphur. Sterling silver is .925 (925%) pure silver. The other .75 is made up of an alloy consisting mainly of copper which oxidizes over time. When copper is exposed to oxygen, it darkens and eventually turns green. Sterling silver doesn't usually turn green but will turn almost black if not protected. Fine silver or .999 silver doesn't tarnish. Argentium silver is a new type of sterling silver that is tarnish-resistant. Only certain chemicals will tarnish Argentium but it will not tarnish from oxidation. Some metals that contain little to no silver are branded with names that make it seem like real silver. One of these metals is nickle silver, which doesn't contain any silver at all.


.925 is a silver content. Sterling silver being 92.5% or higher silver content, the remaining alloys are 7.5%. Some alloys may slow tarnish, but there is no alloy that will eliminate the need for polishing. .750 or 18k gold wont tarnish but may change color with age depending on the remaining .250 alloys. If you are asking if 18k gold plating over a .925 sterling silver base will tarnish, the answer will be when the goldplating has worn off exposing the base metal to the elements, It will tarnish like any other silver.


Tarnish occurs when silver reacts with oxygen or hydrogen sulfide in the air, moisture, skin oil from being handled, and other contaminants.


No, gold does not tarnish. It is because acids and other gases have no effect on it. It does not lose its shine. It is a least reactive metal.


Tarnish is a corrosion product. Any metal can corrode. When iron corrodes it is usually called rust. When chrome corrodes, it is usually called corrosion. When decorative-use metals or alloys corrode, such as gold, silver, brass, or copper, the corrosion is usually called tarnish. Tarnish is a thin layer of corrosion that forms over copper, brass, silver, aluminum, and other similar metals as their outermost layer undergoes a chemical reaction. Tarnish does not always result from the sole effects of oxygen in the air. For example, silver needs hydrogen sulfide to tarnish; it does not tarnish with only oxygen. It often appears as a dull, gray or black film or coating over metal. Tarnish is a surface phenomenon, that is self-limiting unlike rust. Only the top few layers of the metal react, and the layer of tarnish seals and protects the underlying layers from reacting. Tarnish actually preserves the underlying metal in outdoor use and is called patina. The formation of patina is necessary in applications such as copper roofing, and outdoor copper, bronze, and brass statues and fittings.


Tarnish is a thin layer of corrosion that forms over copper, brass, silver, aluminum, and other similar metals as their outermost layer undergoes a chemical reaction.Oxidation is defined as the interaction between oxygen molecules and all the different substances they may contact, from metal to living tissue. However, Tarnish does not always result from the sole effects of oxygen in the air. For example, silver needs hydrogen sulfide to tarnish; it does not tarnish with only oxygen. It often appears as a dull, gray or black film or coating over metal whereas oxidation usually results in brown or green. Hope it helps!! :)


Sterling silver is pure silver adulterated with a small quantity of another metal. The inclusion of this other metal oftentimes is the cause of tarnishing. This explains why some silver pieces tarnish much more than others - it depends on the overall metal mix in the piece. You can actually develop an eye for different makers/time periods/regions of silver pieces due to this factor. For instance, vintage Taxco pieces have a very distinctive patina that differs from that of other period silversmiths, or even from modern Taxco. Pure silver shouldn't tarnish, retaining a very whitish, brilliant shine. It's difficult to find such silver jewelry; a good alternative is rhodium-plated sterling, which also doesn't tarnish easily.


"Real" silver turns green when it is not washed/cleaned. Here is an expiriment you could do: Take two spoons out of your kitchen. Put the spoons where you know you will not forget where it is. Leave them there and if the spoons have not turned even a little bit green in at least 10-30 days then it is not real silver. (DO NOT LET ANYONE TOUCH THE SPOONS UNTILL YOU FIGURE OUT THE ANSWER!) The green that forms on metal is called verdigris. The metal on which it forms is copper (brass, other alloys). If the spoon turns green, it is definitely not silver. Silver tarnishes, that is, turns brown to black. If it doesn't change color at all, it could be made of one of a multitude of alloys. This was the advantage to "nickel silver" (which contains no silver at all) and "German silver," (no silver, either). They would not tarnish, but kept that nice shine. They were also cheaper to produce, since silver, a precious metal, was left out. Or the spoon could be stainless steel, which is most common in households today.


No. Sterling silver is a mixture of copper and silver usually. The reason being silver is usually to soft for making functional objects. Copper increases the strength of the metal and provides increased resistance to tarnish. Other elements like platinum and germanium are also used.


Because it is more beautiful and rarer ANSWER: Unlike silver and other metals, gold does not tarnish.


MEX925 stands for Mexican-made sterling silver. Sterling silver by definition is a silver alloy containing 92.5% silver by weight and 7.5% by weight of some other metal, commonly copper, zinc, or platinum, which help give the silver strength (since pure silver metal is generally too soft for producing functional objects), retain ductility, and prevent corrosion (tarnish). Sterling silver is said to have a fineness of 925, which is the number of parts per thousand of pure metal by weight. Pure silver has a fineness of 999.


Oils and chemicals in perfume can cause tarnish on silver or silver-plated jewelry, it can also damage other types of jewelry; porous stones and gems and costume jewelry. Tarnish can be removed from silver jewelry with a silver polishing cloth or ultrasonic jewelry cleaning machine.


Silver is a very inactive metal. It does not react with oxygen in the air under normal circumstances. It does react slowly with sulfur compounds in the air, however. The product of this reaction is silver sulfide (Ag 2 S), a black compound. The tarnish that develops over time on silverware and other silver-plated objects is silver sulfide.Silver does not react readily with water, acids, or many other compounds. It does not burn except as silver powder.


== == Tarnish is in no way indicative of a low quality in sterling silver. Sterling silver (or .925 silver) is, by law, at least 92.5% pure silver and no more than 7.5% other metals. Sterling silver is an alloy, or mixture, of metals. Pure silver is too soft to be used for most jewelry and household good purposes, so other metals are added to strengthen the metal and make it more durable. Pure silver oxydizes (tarnishes) very slowly, but the addition of other metals to pure silver cause it to oxydize (or tarnish) more quickly. Laws regulate how metals must be marked. In the US, only pure silver can be marked ".999" and only silver of at least 92.5% purity can be marked ".925" or "sterling."


Sounds like it is a metal other than gold or silver. Might be gold or silver plate over a base metal. The gold or silver (if it was plated) could have worn down revealing the base metal, or you might just be having a reaction to whatever metal it is made of...usually will contain copper or nickel, which is why your finger is turning green.


90 % silver 10% copper or other metal


The black tarnish on silver is silver sulfide, Ag2S. Presumably you are boiling silver in a metal pot. The salt water completes an electrochemical cell between the silver sulfide and the aluminum, copper, or iron pot. The oxidized silver in silver sulfide is reduced to silver metal, and part of the metal pot is oxidized; the reaction happens because silver wants to be reduced more than the other metals do. You might imagine that as the metal is oxidized it would become iron, copper, or aluminum sulfide, but the metal sulfides, especially aluminum sulfide, are not so stable. Aluminum sulfide hydrolyzes to aluminum hydroxides and hydrogen sulfide, H2S, the stinky gas, which is probably what you are calling "sulfur".


Basically, yes. Sterling silver means "solid silver, or more properly a solid alloy which is mainly silver". Silver plated means "tin (or aluminium, or iron, or steel, or bronze, or whatever) with a very, very thin coating of silver." ..... Sterling is around 98% solid silver mixed with tiny bit of other metal so that it tarnish less


it could be due to oxidation, a small amount of gases given off from the metal and with a reaction to the skin. Also, your environment could play a part in the metal becoming tarnished. However it is easy to remove, just go and purchase a silver cleaning cloth, it will remove the tarnish and polish the metal at the same time, there are also dual-cleaning cloths available, one side for removing tarnish and the other for polishing. I find that the cloths work better than the chemical jewelry cleaners. I have lots of silver jewelry and the cloths work best for cleaning silver, whether its a necklace, bracelet or ring.


It means sterling silver. Sterling silver by definition is a silver alloy containing 92.5% silver by weight and 7.5% by weight of some other metal, commonly copper, zinc, or platinum, which help give the silver strength (since pure silver metal is generally too soft for producing functional objects), retain ductility, and prevent corrosion (tarnish). Sterling silver is said to have a fineness of 925, which is the number of parts per thousand of pure metal by weight. Pure silver has a fineness of 999. You should not see 925 on any gold jewelry, instead it should have the karats listed.



Silver is found as free metal, or in minerals of other metals.


the answer is silver which is a precious metal other than gold or another type of metal.


Silver - the other precious metal. Silver - the choice that outshines all others.


Gold over Sterling, also known as Vermeil will not tarnish unless the silver is exposed by wear. It can be scratched quite easily though. The bond that gold achieves with silver is much stronger than other 'gold plated/filled' items and is usually applied in a thicker layer.



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