Homebrew PCBs

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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