Homebrew PCBs

Hi Stefan,

I had previously used regular dishwashing detergent. And it helped 
wet out the paper. But did not work as well on the clay coating. The 
green pad is important too. Same technique, the only difference was 
the dishwashing detergent.

In a previous life, I was a textile chemist. We routinely used 
caustic scours to clean the fabvric and machines. This removed dirt, 
oils and binders (startch, PVA and acrylics) used in manufacturing 
the base fabric.

TANSTAAFL!

Myc


--- In Homebrew_PCBs@yahoogroups.com, "Stefan Trethan" 
<stefan_trethan@g...> wrote:
>
> On Tue, 31 Jan 2006 15:47:27 +0100, Mycroft2152 
<mycroft2152@y...>  
> wrote:
> 
> > I found that automatic dish washing detergent helps wet out and 
remove
> >
> > the paper. I let the board soak for 10 minutes in a solution and 
the
> >
> > paper comes off very easily.It's probably the alkalinity in the
> >
> > detergent that helps. After the soak, I use a 3M green pad to 
rub off
> >
> > the paper. I was pleasantly surprised to find that the white 
haze that
> >
> > was usually left on the toner for the clay also was removed. The
> >
> > traces looked nice and black.
> >
> 
> 
> Yes, i notice the same effect with detergent (for manual 
dishwashing). I  
> was thinking it is because it lowers the surface tension / 
increases  
> wetability but it might be the alkalinity too.
> With the detergent i tried the effect was not sufficiently strong 
to  
> justify the added effort in using it compared to plain water, 
especially  
> if i roughen up the back side of the paper with a wire brush or 
sanding  
> paper just before soaking.
> 
> I dunno if the removal of the clay is due to your detergent, or 
the green  
> pad?
> 
> ST
>