[pure-silver] Re: Toning formulas
- From: Sandor Mathe <sandorm@xxxxxxxxxx>
- To: pure-silver@xxxxxxxxxxxxx
- Date: Tue, 25 Apr 2006 16:09:34 -0400
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
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