Back when I was etching boards myself, I was a big fan of ammonium 
persulphate.   Much less nasty than Ferric Chloride.

-forrest

Peter wrote:
> William "Chops" Westfield <westfw <at> mac.com> writes:
>   
>>> I can honestly say I've never smelled chlorine whilst etching
>>>       
>
> As you may have read in the pdf document linked by me before, FeCl3 etches by
> releasing Cl ions into the solution. It is very likely that the presence of some
> impurites can cause HCl and other toxic chemicals to be released into the air
> bubbles that percolate through the solution. The FeCl3 bath has a peculiar
> characteristic smell, but that is not the smell of chlorine. Adding certain
> chemicals to the bath while trying to neutralize it can produce really bad
> fumes, however.
>
> Peter
>
>
>   

-- 
http://www.piclist.com PIC/SX FAQ & list archive
View/change your membership options at
http://mailman.mit.edu/mailman/listinfo/piclist