Homebrew PCBs

Oh, it's Rosin!  That is interesting. I will have to find some and 
give it a try.  Being a natural product, I suspect it shouldn't be 
too hard to find (and have shipped).

Thanks!

Chris



--- In Homebrew_PCBs@yahoogroups.com, "Stefan Trethan" 
<stefan_trethan@g...> wrote:
>
> On Tue, 25 Oct 2005 22:42:12 +0200, lcdpublishing  
> <lcdpublishing@y...> wrote:
> 
> > Okay, that's a new one for me...  Colophony Resin?
> > What is that stuff and where can you get it? I am willing to give
> > just about anything a try - this if fun....
> > Till, see my newest post about fixing traces
> > Chris
> 
> 
> It's resin, from trees like pine, with the turpentine removed.
> 
> <http://en.wikipedia.org/wiki/Colophony>
> 
> It's widely used as soldering flux, and can be left on the PCB 
especially  
> if there are no special requirements for extreme isolation 
resistance  
> etc.. It is not active (not etching the copper) when cold.
> 
> If you get chunks of it you can solve it in alcohol and paint it 
on, or  
> you can buy spraycans where it's already mixed.
> 
> It is important to note that there are wide color/quality 
variations, from  
> almost black to almost like glass. If it is used as flux and 
should remain  
> on the PCB the light colored qualities are preferrable.
> 
> It's also useful as a general purpose brush-on flux.
> 
> ST
>