Homebrew PCBs

thanks adam....

mixture of salts... i see..
i will read the link you provided.. currently occupied with plotting to 
pcb..

st

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> All the common etchants (persulfates, ferric chloride, cupric chloride, 
> HCl+H202) that finished etching copper will precipitate copper(II) 
> hydroxide (bright blue solid) when neutralized. The copper(II) ion is 
> only soluble when the solution is acidic (pH < 7) as it is with all the 
> above etchants. The dried solids will contain mixed salts and copper(II) 
> hydroxide, and maybe some copper(II) oxide. It depends on the etchant. 
> Which etchant were you interested in ?
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> see;
> http://lrs.ed.uiuc.edu/students/erlinger/water/background/ph.html
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> Adam
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