Homebrew PCBs

Rick Sparber wrote:
>  
>
>
> I did have the lye and aluminum outside while I watched from inside. Nasty
> fumes!
>

Note that the Aluminium + Sodium Hydroxide reaction is how one produces 
large quantities of hydrogen without time consuming electrolysis.

http://www.instructables.com/id/Arduino-Radio-Controlled-Hydrogen-Blimp/step9/Aluminum-and-Lye/