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
>