Homebrew PCBs

> Dennis, So in the unmixed form is the muriatic acid going to corrode by 
> fumes leaking or only when mixed with the hydrogen peroxide? I have a 
> steel building and need to know how far from the walls I need to store 
> it so I don't mess it up.
> Thanks,
> Dave
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When its mixed with 3%H2O2 it is even less concentrated. The
combination of both generates less fumes. I usually etch outside and
you dont even notice the fumes. When you store Muratic Acid. If the
lid is not tight fumes will leak out and corrode any metal withing a
foot or so. That is the only percaution you need to take storing.

When mixing be very carefull not to splatter the mixture into you
eyes. Pour the acid into the h2o2 not the h2o2 into the acid. That is
the most dangerous part of the operation and there are some very
noxious fumes generarated at this point. One again keep you eyes away
from the mixture. Use goggle would be the best bet when mixing. And
also if you are manually agitating the pcb up and done in the etchand
to speed the process again you can generate spatters so watch you eyes
here also.

Dennis Waggoner