Homebrew PCBs

On Sat, 27 Jan 2007 08:05:20 +0100, Stig Ankj\ufffdr Pedersen <sap@...>  
wrote:

>
> Although im not an UK'er i thought I would answer anyway.
> I use a combination of sulphuric acid and hydrogen peroxide. Basically  
> the mixture is one part each in five parts water. This stuff works great  
> but.. You need to be careful, have great ventilation and you would need  
> some kind of respiratory protection since this stuff produces chloridic  
> gasses. Other than that you can have your boards etched in a matter of  
> minutes.
> Oh. One more thing. It will only work for about ten or fifteen minutes.


Please, if it produces chlorine gas you are using hydrochloric acid, not  
sulphuric acid. Also, if it produces those fumes you are probably using  
much too high concentrations.


I shudder to think what people are doing without knowing what they are  
doing.

Recently i read on the web that car batteries use hydrochloric acid..  
scary...

ST