Homebrew PCBs

On Sat, 15 Jul 2006 00:27:38 +0200, David Cureton <yahoo@...>  
wrote:

> An I guess a lot of that mist can be mitigated by  having something
> floating on the surface of the etchant so as the tiny bubbles collect
> and form larger bubbles prior to breaking the surface. Most of the mist
> is generated by the surface  tention of the liquid breaking at the
> bubble pops causing tiny droplets of liquid. Therefore if the bubbles
> are collect into larger bubbles before breaking the surface then there
> is less 'surface-tention breaking events' thus less mist.
> Cheers,
> David


You mean like the styrofoam pellets thrown into septic tanks (hole in lid  
== outside loo) in africa to stop dangerous insects from breeding?

I'm not sure that would be so practical, but you are right, a lid makes a  
whole lot of difference. The mist seems to condense on the surfaces.

ST