Homebrew PCBs

On Sun, 21 Jan 2007 17:17:05 +0100, mycroft2152 <mycroft2152y@...>  
wrote:

> I always liked the post where the pcb maker was going to "distill'
> the H2O2 to make it stronger.
> ;)
> Myc


I think you can freeze concentrate it without too much trouble. Those  
interested in using it as rocket fuel know more about that, there are some  
pages about that. But i highly doubt it would be worth the effort for  
etching, even evaporating etchant to get rid of excess water would seem  
easier.
If you try anything like that you should definitely get a hydrometer to  
measure the actual H2O2 concentration.

ST