Homebrew PCBs

Stefan, 

Here in the U.S., you can buy ANYTHING! and I do mean ANYTHING!  If 
you got the money, you can buy it. Sometimes you may need 
some "papers", but you can get anything here.

I don't know if Tarnex is really "Key" to this process.  In reality 
if it is, I would probably do a pre-etch first and then try the 
printing and such.  I am pretty darn sure that all that is needed is 
to clean the pre-existing chemicals and preservatives off the board 
prior to printing.  I would wager to say that we will be able to use 
our existing prep-methods to do the printing.

I have a hunch there are two key elements to this whole ink-jet 
printing thing..

1) The proper type of ink - solvent based as opposed to water based 
and pigmented as opposed to dyes.

2) Curing that ink so that it doesn't wash away.

The little bit of playing around I did with the durabrite ink 
with "Bone stock" PCB material showed me that it not only adheres, 
but it doesn't bead up or puddle like the other inks.  

So, I wouldn't worry too much about the Tarnex at this time.

But then again, I have been plenty wrong many times before :-)

Chris


--- In Homebrew_PCBs@yahoogroups.com, "Stefan Trethan" 
<stefan_trethan@...> wrote:
>
> On Wed, 19 Apr 2006 20:53:14 +0200, Steve <alienrelics@...> wrote:
> 
> > Looking up where to find Tarn-X, I found out that the chemical 
in it
> >
> > can be bought for next to nothing.
> >
> >
> > http://www.ganoksin.com/orchid/archive/200305/msg00153.htm
> 
> 
> This one says it's thiourea!
> 
> "Toxic. Known animal carcinogen and probable human carcinogen."
> 
> And they still sell it in the US? Does it carry a health warning?
> 
> I'm not certain that link you gave is correct, but if it is, i'm 
out.
> I decided some time ago i don't want to use that chemical (it 
would be  
> needed for electroless tin plating).
> 
> ST
>