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Re: [Homebrew_PCBs] cool-amp

2005-12-02 by Stefan Trethan

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 anger\ufffdhrt.
(make-up: The ingredients are mixed to a paste.)
Hinweis: Die zu versilbernden Gegenst\ufffdnde werden damit abgerieben oder man  
l\ufffdsst 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 Schl\ufffdmmkreide
(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 gel\ufffdst. Getrennt davon wird  
das Kochsalz in etwas Wasser gel\ufffdst. Man vereinigt beide L\ufffdsungen und  
vermischt damit die restlichen Zutaten in einem M\ufffdrser.
(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 getr\ufffdnkt 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 Gegenst\ufffdnde m\ufffdssen vor dem Versilbern erst kurz in eine  
Kupfersulfatl\ufffdsung 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://\ufffdtzradierung.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

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