Homebrew PCBs

sir_tancred  wrote:
> I'm a bit curious.  I've read online about Photo Etch setups, and one 
> thing that seems popular is an acid solution that grows as you use 
> it, basically it uses chemicals that will combine with the copper to 
> create more acid each time you etch.
> 
> What I'm curious is if there is a similiar etching solution that 
> could be used for Brass?  Since I'm interested in photo etching from 
> a modellers perspective, I'd rather use cheaper brass. :-)

I've tried etching thin copper and brass shim with ferric chloride and
found it's a *lot* harder than the copper on pcb. Think its got something
to do with the phosphorous content in pcb copper.