I always wear a cartridge respirator that is designed to adsorb H2S (I
think I got it at Grainger) and combine this with the exhaust fan turned
up to high speed. Better safe than sorry.
Koch, Gerald wrote:
However, at higher concentrations H2S desensitizes the nose and can no longer be detected. This has caused numerous deaths from H2S poisoning.
Jerry
-----Original Message----- From: pure-silver-bounce@xxxxxxxxxxxxx [mailto:pure-silver-bounce@xxxxxxxxxxxxx] On Behalf Of Sandor Mathe Sent: Tuesday, April 25, 2006 4:10 PM To: pure-silver@xxxxxxxxxxxxx Subject: [pure-silver] Re: Toning formulas
I do know that H2S is one of the chemicals that the human nose can detect at extremely low concentrations. If If remember right, like the mercaptans in skunk spray it can be detected in the parts per billion range.
>It's easy to fog a piece of undeveloped paper if you expose it to the >fume coming out of the tray for a few moments and then develop normally. >Exposure to H2S gas creates silver sulfide cluster on silver halide >surfrace and when this is large the crystal is developable. It doesn't >take many molecules on each crystal to render the crystal developable.
Sandor
-- John Bower http://www.studioindiana.com/
