Archive of the former Yahoo!Groups mailing list: Homebrew PCBs

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