On Wed, 12 Apr 2006 23:28:03 +0200, Alan Marconett <KM6VV@...> wrote:
> HI Stefan,
>
>
> I searched the archives, didn't find a recipe (no problem), but I did
> read
>
> all the great posts on Cool-amp. Probably where I first heard of it in
> '02!
>
>
> The plumber's paste sounds useable as well. I might try it, although I
> have
>
> a few other uses for the pure silver plating as well.
>
>
> Alan KM6VV
below a copy of the post with the recepie.
I asked my chemicals shop for prices and they told me
25g Silberchlorid € 128,33
25g Silbernitrat € 98,44
so that's quite steep prices.
Now if there was a way to somehow create these chemicals out of something
like silver coins or flatware that might be cheaper. Should you find
something let me know.
Silver plating might not be so great anyway, since it tarnishes too.
ST
Did some reading, and found a german page that lists several plating and
electroless plating recepies.
The relevant ones are:
Versilbern von Kupfer/Messing
(silver plating of copper/brass)
Zutaten:
(ingredients:)
10 g Silberchlorid
(10g silver chloride)
65 g Kaliumhydrogentartrat (=Weinstein)
(65g cream of tartar)
30 g Natriumchlorid (=Kochsalz)
(30g NaCl / table salt)
Wasser
(water)
Ansatz: Die Zutaten werden mit Wasser zu einem Brei angerührt.
(make-up: The ingredients are mixed to a paste.)
Hinweis: Die zu versilbernden Gegenstände werden damit abgerieben oder man
lässt den Brei darauf antrocknen. Mit Kreide wird
nachgeputzt.
(Notice: Rub the items to be plated with it or let the paste dry on them.
Polish with chalk.
second recepie:
Versilbern verschiedener Metalle
Zutaten:
(Silvering of various metals, ingredients:)
10 g Silbernitrat
(10g silver nitrate)
3,3 g Natriumchlorid
(3.3g NaCl/table salt)
10 g Kaliumhydrogentartrat (=Weinstein)
(10g cream of tartar)
20 g Schlämmkreide
(20g precipitate chalk (calcium carbonate))
87 g Wasser
(87g water)
50 g Salmiakgeist
(50g spirits of ammonia / ammonia solution)
Ansatz: Das Silbernitrat wird in etwas Wasser gelöst. Getrennt davon wird
das Kochsalz in etwas Wasser gelöst. Man vereinigt beide
Lösungen und vermischt damit die restlichen Zutaten in einem Mörser.
(make-up: The silver-nitrate is solved in some water. Separate of it the
table salt is solved in some water. Unite both and mix
with the remaining ingredients in a mortar.)
Hinweis: Die Mischung darf keinem hellen Licht ausgesetzt werden.
(Notice: This mixture mustn't be exposed to bright light.)
Zum Versilbern wird der metallene Gegenstand mit Salmiakgeist gereinigt
und mit einem wollenen Lappen, der mit der Mischung
getränkt ist, gut gerieben, bis sich eine Silberschicht niedergeschlagen
hat.
(To silver plate the item is cleaned with ammonia solution, and rubbed
with a woolen rag saturated with the plating mixture until
a silver layer is deposited.)
Eiserne Gegenstände müssen vor dem Versilbern erst kurz in eine
Kupfersulfatlösung getaucht werden.
(Items made of iron must be dipped in a copper suplhate solution before
silver plating.)
German instructions for those (and more) can be found at
<http://ätzradierung.de/radierung/radihtm65.html>, translation courtesy of
myself, no liability if i made a mistake
Notice the _impressive_ similarity with cool-amp, the silver compound,
table salt, calcium carbonate, that's more or less it. Also,
these are quite likely ancient recepies so there should be no legal
issues like there would be when trying to copy cool-amp
specifically.
I'm quite eager to try those, i'll be at my chemicals shop next week for
sure! The first one seems easier to me.
While i'm OK satisfied with the solderpaste results i'd be more than happy
to find a cold method for silver plating.
I'll let you know about what i find.
ST