Silver Tone Coin
August 23rd 2010 Posted at Antiques
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Silver Tone Coin
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 uniqueChinese old Silver Tone COIN Islamic text  US $3.25
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would sulfur oxide or sulfuric acid rainbow tone a silver coin?
there are different speculations and combinations of certain chemicals that would tone a coin to a rainbow color and i am looking for the best combination and mixture to make this work on a personal collection of 90% silver coins
I had a friend who tried this with mixed success. He wrapped the coins in moist tissue. I don't remember the chemical used. Silver reacts easily with sulfur to form a black tarnish of silver sulfide. If the layer is extrememly thin, it becomes semi transparent and produces the rainbow effect. Silverware tarnishes when food produces hydrogen sulfide gas. Things like eggs will generate a certain amount of it. If they rot, they produce a lot and this is why it is called "rotton egg gas". Hydrogen sulfide forms a weak acid when it dissolves in water. Some old plumbing has water which smells like rotton eggs because of the hydrogen sulfide content. A less smelly source of sulfur is sodium sulfite. It is a salt of sulfur and I think photography stores might sell this chemical. It isn't much more dangerous than ordinary table salt. A solution of it will react with silver, forming a black coat of tarnish. If the concentration of sodium sulfite is very low, the tarnish layer will be very thin and this might produce rainbow colors. The trick is going to be in figuring out just how much to add. I suggest experimenting with some less valuable pieces of silver. If too much tarnish forms, just erase it with some anti-tarnish solution like "tarnex". The reaction of sodium sulfite and silver will probably produce caustic soda as a byproduct and this will decompose the tissue. Hydrogen gas will be the other byproduct. It is flammable, but not enough will be produced to create any fire hazard. It is the caustic soda which can burn skin, so use lots of water to rince everything afterwards the sulfite treatement. Sulfur di-oxide and sulfuric acid are far more dangerous than sodium sulfite. Sulfur dioxide smells awful and can even be toxic if it accumulates in a closed room. Sulfuric acid can cause some nasty burns, especially the concentrated form. The acid also heats up if water is added, so always add it to water instead. I don't think the acid nor the oxide will tarnish silver though. The sulfur is already oxidized and will stay combined with this instead of combining with the silver to produce tarnish.
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Silver Tone Coin
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