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#1
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Silver question.
Hi.
I have repair shop that I have established since 1982, and I have encountered many difficulties. but I need a technical answer about silver oxidation. Recently I have received many silver items to polish, some of them with Ecoat, antitarnish, Ecoat with antitarnish. usually I deep them into potassium cyanide (commercial grade) and it does the job to remove oxidation, like chains, rings, etc. but these items they even resist to cyanide, I am doubting about anti tarnish that aged to a point that itself changed the color, and prevent cyanide acid to do it's job. Need to hear your experience about this issue. George. |
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#2
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Silver question.
George wrote:
Hi. I have repair shop that I have established since 1982, and I have encountered many difficulties. but I need a technical answer about silver oxidation. Recently I have received many silver items to polish, some of them with Ecoat, antitarnish, Ecoat with antitarnish. usually I deep them into potassium cyanide (commercial grade) and it does the job to remove oxidation, like chains, rings, etc. but these items they even resist to cyanide, I am doubting about anti tarnish that aged to a point that itself changed the color, and prevent cyanide acid to do it's job. Need to hear your experience about this issue. George. If Ecoat? is some sort of lacquer based cover painted on, the youll need to strip it off with say methelene chloride. If however its say rhodium plating then a rhodium plating stripper will be needed. Dont know of one myself. yuoll have to look it up on google. |
#3
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Silver question.
My understanding, Ecoat stands for electro coating of pure silver over 925,
but anti tarnish is a lacker based clear liquid .I am forced to belive that anti tarnish itself changes color, so it needs to be removed prior polishing. I have never used methelene chloride. it sounds like a kind of solvent. My jeweler supplier never heard about it. Have you used it? from where to get it? by the way I hate to see manufacturers rhodium plates over silver. it eliminates oxidation but whenever consumer returns an item to polish because the surface used and rhodium gets darker it is a big headache. I hate to polish these items. "Ted Frater" wrote in message ... George wrote: Hi. I have repair shop that I have established since 1982, and I have encountered many difficulties. but I need a technical answer about silver oxidation. Recently I have received many silver items to polish, some of them with Ecoat, antitarnish, Ecoat with antitarnish. usually I deep them into potassium cyanide (commercial grade) and it does the job to remove oxidation, like chains, rings, etc. but these items they even resist to cyanide, I am doubting about anti tarnish that aged to a point that itself changed the color, and prevent cyanide acid to do it's job. Need to hear your experience about this issue. George. If Ecoat? is some sort of lacquer based cover painted on, the youll need to strip it off with say methelene chloride. If however its say rhodium plating then a rhodium plating stripper will be needed. Dont know of one myself. yuoll have to look it up on google. |
#4
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Silver question.
George wrote:
My understanding, Ecoat stands for electro coating of pure silver over 925, but anti tarnish is a lacker based clear liquid .I am forced to belive that anti tarnish itself changes color, so it needs to be removed prior polishing. I have never used methelene chloride. it sounds like a kind of solvent. My jeweler supplier never heard about it. Have you used it? from where to get it? by the way I hate to see manufacturers rhodium plates over silver. it eliminates oxidation but whenever consumer returns an item to polish because the surface used and rhodium gets darker it is a big headache. I hate to polish these items. "Ted Frater" wrote in message ... George wrote: Hi. I have repair shop that I have established since 1982, and I have encountered many difficulties. but I need a technical answer about silver oxidation. Recently I have received many silver items to polish, some of them with Ecoat, antitarnish, Ecoat with antitarnish. usually I deep them into potassium cyanide (commercial grade) and it does the job to remove oxidation, like chains, rings, etc. but these items they even resist to cyanide, I am doubting about anti tarnish that aged to a point that itself changed the color, and prevent cyanide acid to do it's job. Need to hear your experience about this issue. George. If Ecoat? is some sort of lacquer based cover painted on, the youll need to strip it off with say methelene chloride. If however its say rhodium plating then a rhodium plating stripper will be needed. Dont know of one myself. yuoll have to look it up on google. So if its a pure ie 999 silver electroplate on 925 then any bright dip will clean it up . Im surprised your cyanide wont touch it. Re Methelene chloride, Im in the UK and I get it from a chemical wholesale house. Its not something a jewellers supply house stock.. Now itsa VERY strong solvent of all paints inc 2 pack and abs plastic. Its the basis of paint stippers. that are not based on sodium or potassium hydroxide. |
#5
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Silver question.
In article , "George"
wrote: even resist to cyanide, I am doubting about anti tarnish that aged to a point that itself changed the color, and prevent cyanide acid to do it's job Comment The words "cyanide acid" appear to me to be nothing short of frightening! Just see the words juxtaposed is enough to put me off my lunch! Cyanide must never see any kind of acid. It is a chemically weak substance, although a strong poison, and should NEVER be allowed anywhere near any acid. Even the carbon dioxide in the air will cause sodium, or potassium cyanide partially to decompose,, liberating some deadly hydrocyanic acid, unless solutions of these substances are kept alkaline. G.H.Ireland -- _ _________________________________________ / \._._ |_ _ _ /' Orpheus Internet Services \_/| |_)| |(/_|_|_ / 'Internet for Everyone' _______ | ___________./ http://www.orpheusinternet.co.uk |
#6
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Silver question.
"Ted Frater" wrote in message ... George wrote: My understanding, Ecoat stands for electro coating of pure silver over 925, but anti tarnish is a lacker based clear liquid .I am forced to belive that anti tarnish itself changes color, so it needs to be removed prior polishing. I have never used methelene chloride. it sounds like a kind of solvent. My jeweler supplier never heard about it. Have you used it? from where to get it? by the way I hate to see manufacturers rhodium plates over silver. it eliminates oxidation but whenever consumer returns an item to polish because the surface used and rhodium gets darker it is a big headache. I hate to polish these items. "Ted Frater" wrote in message ... George wrote: Hi. I have repair shop that I have established since 1982, and I have encountered many difficulties. but I need a technical answer about silver oxidation. Recently I have received many silver items to polish, some of them with Ecoat, antitarnish, Ecoat with antitarnish. usually I deep them into potassium cyanide (commercial grade) and it does the job to remove oxidation, like chains, rings, etc. but these items they even resist to cyanide, I am doubting about anti tarnish that aged to a point that itself changed the color, and prevent cyanide acid to do it's job. Need to hear your experience about this issue. George. If Ecoat? is some sort of lacquer based cover painted on, the youll need to strip it off with say methelene chloride. If however its say rhodium plating then a rhodium plating stripper will be needed. Dont know of one myself. yuoll have to look it up on google. So if its a pure ie 999 silver electroplate on 925 then any bright dip will clean it up . Im surprised your cyanide wont touch it. Re Methelene chloride, Im in the UK and I get it from a chemical wholesale house. Its not something a jewellers supply house stock.. Now itsa VERY strong solvent of all paints inc 2 pack and abs plastic. Its the basis of paint stippers. that are not based on sodium or potassium hydroxide. . Well if it is protected with lacker, probably it prevents it from cyanide as well. by the well I have to tell you, some of them has sensitive stones. I use potassium, do you use potassium or sodium cyanide? maybe mine it is old, on monday I'll get some fresh one for the sake of science. I'll post my experience. |
#7
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Silver question.
Sounds to me that it is not tarnish (silver oxide) but simply a layer
of Lacquer that need to be removed. We have always relied on soaking the item in a good ladies nail varnish remover followed by a 20 minute soak in a heated acid bath containing pickling salts. Afterwards apply to a polish motor in the usual way. The other substance we found helps is soaking the item in Windolene (don' ask why). The problem is the time it takes is equivalent to making the piece from scratch so (unless the items have antiquity/personal value attached to it) is it really worth it. |
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