Do you know how much power to put in a gallon of pure water? Is this the same for sodium persulphate? Friendly Regards Octavio Nogueira =================================================== nogueira@propic2.com ICQ# 19841898 ProPic tools - low cost PIC programmer and emulator http://www.propic2.com =================================================== ----- Original Message ----- From: "Kathy Quinlan" To: Sent: Monday, July 16, 2001 8:53 PM Subject: Re: [ee]: pc board traces got erased too? > Ammonium persulphate does not have a short shelf life (unless 2 years is > short) I had some that worked over 2 years, agreed the sq inches etched was > not excessive, maybe a100 or so with about gallon of solution, only last > year did I have to mix some more powder in (apron 3.5 years later) > > Regards, > > Kat. > > ----- Original Message ----- > From: "Lawrence Lile" > To: > Sent: Monday, July 16, 2001 9:19 PM > Subject: Re: [ee]: pc board traces got erased too? > > > > > Ammonium persulphate? Mouser sells it - I gather that once mixed shelf > > > life is short. How to properly dispose of it I don't know. > > > > > > > I believe it is OK just to dump it in the drain. I think there was a long > > thread on this one time... > > Ferric chloride definitely does not belong in the city sewers, must be > > disposed of as haz waste. > > > > > Recent thread discussed rejuvenating ferric chloride by electroplating > > > out the Cu - I mentioned this to a chemically adept acquaintance, he > > > seems to think it's do-able. > > > > > > > Ya, it is possible, and also possible to produce a lot of hydrogen gas > > (boooom!). Be careful. Ferric chloride is really pretty cheap. I think > > this possibility was considered in the long ambling thread on this > subject. > > Personnally, I don't see the need. > > > > > regards, Jack > > > > > > > -- > > http://www.piclist.com hint: PICList Posts must start with ONE topic: > > [PIC]:,[SX]:,[AVR]: ->uP ONLY! [EE]:,[OT]: ->Other [BUY]:,[AD]: ->Ads > > > > > > -- > http://www.piclist.com hint: PICList Posts must start with ONE topic: > [PIC]:,[SX]:,[AVR]: ->uP ONLY! [EE]:,[OT]: ->Other [BUY]:,[AD]: ->Ads > > -- http://www.piclist.com hint: The list server can filter out subtopics (like ads or off topics) for you. See http://www.piclist.com/#topics