In message <200409131926.i8DJQT3g023006@outbound3.mail.tds.net> wrote: > > Hardly surprising. That's a "piranha mix". I'd be VERY surprised if you > > managed to make CuCl etchant out of it - it degrades pretty quickly. > > How did you convert it into CuCl? Just dump a load of copper into it to get > > rid of the free chlorine? > > Well, yeah- but not so crudely :o) I used it to etch a PCB. And yes it does > produce CuCl after adding the copper. Nice emerald green color and > everything. OK then - what's the mix ratio (Water:H2O2:HCl)? HCl seems to be available over here, but it's the sort of thing you have to special-order (or get mail-order). Not sure about peroxide though. > The beauty of HCl and H2O2 is availability. I can't speak for other > countries, but here in the USA HCl sold under the common name muratic acid > (about 32% strong) is commonly used for adjusting PH in swimming pools and > for masonry cleanup. 3% H2O2 (medical grade) is used to wash minor cuts and > scrapes. It's available at any pharmacy- even my local grocery store has it > for $0.49 a pint. Having just read the MSDSes for H2O2 (3%) and HCl (3% iirc) and some info on HCl/H2O2 mixes, I don't particularly like the idea of using this stuff... Far too volatile for my liking... Back to FeCl3 it seems :-/ Later. -- Phil. | Acorn Risc PC600 Mk3, SA202, 64MB, 6GB, philpem@dsl.pipex.com | ViewFinder, 10BaseT Ethernet, 2-slice, http://www.philpem.dsl.pipex.com/ | 48xCD, ARCINv6c IDE, SCSI ... I call my computer Hole in the Desk _______________________________________________ http://www.piclist.com View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist