----Thanks to everyone for the info , I was a weak on Cupric, (I spent
my life using mostly Ammonium and Ferric, amongst other more exotic
etches) 

Any way one more simple or not so simple question :

        Would you run a Cupric etcher @ 140g/l Cu and 5N HCl .? 

        Is It a correct assumption that somewhat lower N, and higher
copper would , provide faster etch rate. It just seems to me that
operating at an extreme N will basically just cost money in the form of
excess HCL usage , not to mention the wear and tear on the equipment,
and operators.,


Again thanks for the information!

Russell Smith

	

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