Steve Thompson wrote:
> Clock restorers use something that works the same for resilvering
> chapter rings and other brass parts. Basically it's silver nitrate
> and salt. They also usually use a 'finisher' powder which (I
> think) is to neutralise acidity. I'm told sodium bicarbonate works
> fine for that.
>
> Somewhere I have an old HR or QST article describing how to plate
> using spent photographic fixer. Probably not so easy to come by
> these days.
>
Actually there's lots of it around, just difficult to get due to the
hazardous associated with it. That and there is a "replacement" system
where you just place a couple of "bricks" coated with a material that
replaces the silver in the spent fixer. The photo finishers are then
paid for the silver. Last I knew the guys who came up with that made a
bundle, but I've not had anything to do with that industry for nearly 15
years. I did my own B&W where the chemicals were cheap, but the paper
was expensive. With color printing it's the paper thats cheap, but the
chemicals are expensive. Bout $3.00 USD for the chemicals to do *one* 8
X 10 or even 16 X 20 while for B&W the paper ran bout 50 cents a sheet
while a quart of chemicals would do 100 to 200 8 X 10s. depending on
when, if, and how you used replentisher. Fixer was cheap! Developer
was not bad. Stop bath ran a longggg time.
At any rate there would be plenty of silver to put a useful coat on a
tank coil several thousandths thick which is more than enough even at
HF. OTOH the difference in resistance between pure silver and copper for
that length and diameter is not a great deal. BTW as it ages Silver can
get to look pretty crappy too.
A final note, they call it hazardous, but the stuff makes a great
fertilizer additive for the flower beds. Contains IIRC Sodium Sulphate.
73
Roger (K8RI)
> Steve
>
>
>> The product is call Cool-Amp, $30 for a 2 ounce jar. Electricians use
>> it on buss bars. You take a wet rag, rub it on, and rinse.
>>
>> David
>> KC2JD/4
>>
>>
> ......
>
>>> BTW there is a chemical mix that will flash plate by just wetting it and
>>> then rubbing it on the copper. It is hazardous, but nothing like the
>>> plating chemicals.
>>>
>>>
> _______________________________________________
> Amps mailing list
> Amps@contesting.com
> http://lists.contesting.com/mailman/listinfo/amps
>
>
_______________________________________________
Amps mailing list
Amps@contesting.com
http://lists.contesting.com/mailman/listinfo/amps
|