On Monday 22 August 2005 10:53 am, Marvin Dickens wrote: > On Monday 22 August 2005 05:41 am, Dave wrote: > > I think Kool-amp powder is a better solution for homebrewers as it's (at > > least for me) more convenient and much less hazardous than the recipies > > you posted. The only drawback seems to be that it's pricy stuff. I would like to point out one thing. Also, I do not mean for this to be a rant or flame job, because it's not: 1.) Making PCBs at home is as potentially hazardous (If performed with impunity) as immersion plating. As an example: 1.) Ferric chloride evolves chlorine gas 2.) Cupric chloride evolves chlorine gas 3.) Ammonium sulfate evolves toxic oxides of phosphates All three are poisonous and highly reactive with inorganic and organic substances (Including skin). FWIW, Kool Amp is poisonous and the powder is easily dispersed into the air. See the MSD for silver nitrate: http://www.cdc.gov/niosh/ipcsneng/neng1116.html I am amazed that everytime the subject of immersion plating comes up on this list people immediate start talking about how dangerous it is. Etching is dangerous. Charcole grilling with friends is dangerous (And it pollutes and causes cancer). Using toilet bowl cleaner to clean toilets is dangerous (Read the side of the container). Dishwashing detergent that goes into an electric dishwasher is dangerous (You'd be surprised how dangerous this stuff really is). Where does it all end? I suppose I'm saying the amount of danger associated with most things in life is directly proportional to the amount of disregard and impunity it is executed with. Regards Marvin
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