Archive of the former Yahoo!Groups mailing list: Homebrew PCBs
Subject: math check
From: DJ Delorie <dj@...>
Date: 2008-06-25
someone check my math and assumptions, please...
I have 3l of etchant (HCl/H2O2) on its way to a CuCl etchant.
To get the specific gravity from 1.0 to 1.2, that means I need to add
about 600g of copper? And that solution will etch another 600g of
copper before it hits 1.4 ? (plus or minus adjustments for increased
volume, added HCl, etc)
(yes, it's at 1.0 now - I weighed 100ml of solution, it's 100g)
Seems like a lot of copper.