> -----Original Message-----
> From: Homebrew_PCBs@yahoogroups.com
> [mailto:Homebrew_PCBs@yahoogroups.com]On Behalf Of Lez
> Sent: Saturday, January 27, 2007 4:05 PM
> To: Homebrew_PCBs@yahoogroups.com
> Subject: Re: [Homebrew_PCBs] UK'ers, anyone in uk _not_ using fecl ?
>
>
> >
> > That sounds like it must have been Sulfuric Acid-based (H2SO4), and you
> > somehow generated Hydrogen Sulfide (H2S) - which gives off the
> "rotten-egg"
> > smell
> >
> > And that is _NOT_ the acid you want....
> >
> > Randy
>
> Ok 1 product down............
>
> Is H2S dangerous, think I heard it mentioned about cats on cars
>
> Lez
Lez
Lets just say sticking a match into a container of it while holding it close
to your face amy not help your appearance.....
from Wikipedia:
"Hydrogen sulfide is a highly toxic and flammable gas. Because it is heavier
than air it tends to accumulate at the bottom of poorly ventilated spaces.
Although very pungent at first, it quickly deadens the sense of smell, so
potential victims may be unaware of its presence until it is too late. For
more information see an MSDS."
Stefan - Wikipedia also says
"Hydrogen sulfide used to have importance in analytical chemistry for well
over a century, in the qualitative inorganic analysis of metal ions. For
such small-scale laboratory use, H2S was made as needed in a Kipp generator
by reaction of sulfuric acid (H2SO4) with ferrous sulfide FeS."
I can't see producing H2S from NaOH (lye), which might be another driveway
cleaner product ingredient, and I can't see producing it from just a
detergent-based product....