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