Homebrew PCBs

Aha, now I understand. Thanks Stefan.
If the board is not perfect verticaly, but a little bit inclined at 
30* or less, maybe will be same effect.


Adrian 

--- In Homebrew_PCBs@yahoogroups.com, "Stefan Trethan" 
<stefan_trethan@g...> wrote:

> 
> The discussion back then was the lower edge of the board etches 
faster -  
> why?
> probably because the bubbles hit the lower edge, but then drift away 
from  
> the board as they rise.
> If one would put a wedge "guide" there, combined with largish 
bubbles,  
> that would press them against the pcb all the way.
> 
> ST
>