[pure-silver] Re: KBT fog - was Re: KRST
- From: "Richard Knoppow" <dickburk@xxxxxxxxxxxxx>
- To: <pure-silver@xxxxxxxxxxxxx>
- Date: Wed, 22 Aug 2007 07:30:26 -0700
----- Original Message -----
From: "Jeffrey Thorns" <puresilver@xxxxxxxxx>
To: <pure-silver@xxxxxxxxxxxxx>
Sent: Wednesday, August 22, 2007 6:09 AM
Subject: [pure-silver] KBT fog - was Re: KRST
>
I found the odor of hydrogen sulfide very hard to bear
when I stupidly used
the brown toner in my darkroom. That is an outdoor
activity. It'll fog
photosensitive materials, too, so doing it in my darkroom
was dumb.
So, using KBT in a darkroom (without adequate ventilation)
could conceivably fog unexposed paper? Is the result a
general fog and loss of contrast?
I assume that the amount of KBT in the air would have to
be substantial.....
Its the Hydrogen Sulfide gas, the stuff that smells like
rotten eggs. Its a very powerful photoactive agent and can
cause fogging of sensitive materials. Use any kind of
sulfiding toner (anything that has the rotten egg odor) away
from film or paper. Also, the stuff is very irritating even
in amounts well below where its toxic so should be used with
plenty of ventillation.
---
Richard Knoppow
Los Angeles, CA, USA
dickburk@xxxxxxxxxxxxx
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