Quoting Denny Esterline : >> >> I do not use ferric chloride but I use muratic acid and >> hydrogen peroxide. 2 parts hydrogen peroxide and >> 1 part muratic acid and use at room temp. This does >> the best and fastest etching of any thing I have seen. >> You do not want to breathe the fumes and the fumes >> are corrosive so don't expose any metal to the fumes. > > > I was a big proponent of this stuff a couple years ago (check the archives > for a couple of write ups) but there's a big detail missing in this short > description. When you first mix the HCL and H2O2, the etch chemistry is, > basicaly, free chlorine. Nasty, nasty stuff. But once you've added a fair > bit of copper it becomes a mixture of copper chlorate, wonderful stuff. It > doesn't stink, and it's completely regenerable by simply adding oxygen (I > use an aquarium pump to bubble air through it). > > Good luck - and watch out for the toxic chlorine gas- > -Denny Double the fun-- an efficient etchant *and* a chemical weapon: > --http://en.wikipedia.org/wiki/Chlorine#Use_as_a_weapon Best regards, Spehro Pefhany -- "it's the network..." "The Journey is the reward" s...@interlog.com Info for manufacturers: http://www.trexon.com Embedded software/hardware/analog Info for designers: http://www.speff.com -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist