Homebrew PCBs

Anyone near me (Tacoma, WA) want about 6 or 7 pounds of dry FeCl
cheap? ;')

Steve

--- In Homebrew_PCBs@yahoogroups.com, Stefan Trethan
<stefan_trethan@g...> wrote:
> 
> just mixed the etchant for the new tank - put a small test piece in and
> it worked WAY faster than the old etchant did..
> you could watch it dissolving (no more than 1 minute, probably less).
> 
> I used HCL diluted to about 10% or a bit less. then i added a bit H2O2, 
> more
> than usual but from a very old bottle i assumed not very
concentrated any 
> more.
> 
> I did not add any cupric cloride, jsut the plain acid and H2O2.
> 
> Why is it so fast - with NO GASSING ?
> 
> i want to keep it that fast when it gets older - now i have the
hydrometer 
> and can
> check the molarity it may be better...
> 
> i will record this data for future comparision, but i am unsure if
it makes
> any sense to check the density if there is no copper in...
> 
> thanks for any explanation...
> 
> 
> 
> ST