I have a suggestion for you: show us your first board and then
concentrate on improvements.
Mike
--- In
Homebrew_PCBs@yahoogroups.com, Udara Dewamuni <dewamuni@y...>
wrote:
> Hi there,
>
> Thank you very much guys, ur information was
> really helpful for my experiment about the etching
> chemicals. U know what, if we could add some
> chromic/pottasium alum to the mixture of HCl and H2O2
> it may increases the etching speed. Anyone knows the
> chemistry explanation for that.
>
> The other thing is i have heard about a
> powder which can prevent that clorine gas when u do
> the etching. If anyone knows that what is that powder
> and it contains pls let me know.
>
> Cheers,
> Udara
>
>
>
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