Homebrew PCBs

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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