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Old November 10th 07, 05:38 PM posted to rec.crafts.jewelry
George
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Posts: 7
Default 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.

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