Homebrew PCBs

On Tue, 2009-07-07 at 18:15 +0200, Stefan Trethan wrote:
> Then the solution is obvious. We must all get involved with model
> reocketry and H2O2 motors, then the complications purchasing 30% H2O2
> will look insignificant compared to purchasing the 98% stuff. Problem
> solved!


Humorous and realistic approach. 

For CuCl 3% H2O2 do super fine to initiate it, and even 100% grade will
be little stupid to regenerate since you will be always increasing and
diluting the solution.

I try to buy it for H2SO4 based etchant only, in  minor grade can only
be used as micro etch. In high grade H2O2 can be more stable, but is
dangerous as etchant, copper catalyze H2O2 decomposition, like silver in
rocketry. ThinkTink sell an mandatory stabilizer for this purpose. But
getting 35% H2O2 should be as easy as asking to a chemical supplier.

But still H2O2 as oxygen source always increase solution volume. The
best approach will be using a chemical addictive that, when  bubbling
oxygen will retain it on solution. My low skills chemistry thinks on
benzene but will not work. And a top-bottom approach can work for Steve
Jobs because is software, this is chemistry.


On Tue, 2009-07-07 at 12:18 -0500, Jack Coats wrote: 
> compressed nitrogen pushing H2O2 out of the 'jet' nozzles where it was
> pressed through some platinum screen that caused the H2O2 to
> disassociate into H2O and H2 along with enough heat to ensure the
> water was flashed into steam.
> 

Isn't decomposition in O2 and H20 steam? On a silver catalyst?