Homebrew PCBs

99% "without further purification" if you read <http://pubs.acs.org/doi/suppl/10.1021/ja209267c/suppl_file/ja209267c_si_001.pdf>

Donald.
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----- Original Message -----
> From: "Dave" <wa4qal@...>
> To: "Homebrew PCBs" <Homebrew_PCBs@yahoogroups.com>
> Sent: Thursday, January 19, 2012 11:08:37 AM
> Subject: [Homebrew_PCBs] Re: Silver Ink
> --- In Homebrew_PCBs@yahoogroups.com, Mark Lerman <mlerman@...> wrote:
> >
> > The silver acetate seems to go for about $2 USD per gram from
> > "legitimate" sources, less from ebay.
> 
> Is that lab grade or technical grade? There's a HUGE price
> difference between the 99% purity stuff, and the 99.9% purity
> stuff. :-)
> 
> For that matter, has anyone researched how to produce Silver
> Acetate themselves? It's probably a lot more complex than
> simply dropping some Silver coins into a bottle of vinegar.
> 
> Ok, having looked it up on wikipedia, it looks like there's a
> three step process (Silver + Nitric Acid->Silver Nitrate +
> Sodium Carbonate -> Silver Carbonate + Acetic Acid ->
> Silver Acetate.). That's not too complex. I think the real
> problem with the cost is that the price of Silver is rather
> incredible at the moment.
> 
> > They mix 1 g with 2.5ml of ammonium hydroxide plus .2ml formic
> > acid. Assuming you can get 2 ml of ink from the mixture and that
> > the cost of the ammonium hydroxide and formic acid are negligible
> > (???), the cost would be about $1 USD/ml.
> 
> Ammonium Hydroxide is simply ammonia in water.
> 
> Formic Acid isn't too hard to synthesize (via a couple of routes),
> so it should be reasonably cheap. Don't get it on you. It's
> the active ingredient in bee and ant stings.
> 
> > Since you are only drawing traces, it shouldn't be too
> > expensive, especially if you can reuse any ink wasted in head
> > cleaning. Anyone interested in a group buy of the chemicals?
> 
> I doubt that the cleaned ink from the head could be reused. But,
> a little care in batching up the plots could minimize waste.
> 
> > Mark
> 
> Dave <- Not a chemist, but I occasionally bathe in H2O!
> 
>