----- Original Message ----- From: "BertS" <aasainz@xxxxxxxxxxxxx>
To: <pure-silver@xxxxxxxxxxxxx>
Sent: Wednesday, May 20, 2009 3:45 PM
Subject: [pure-silver] Re: AZO and Benzotriazole for anti-fogging
Bogdan Karasek wrote:
Hello,
I want to do some contact printing using AZO paper that has been kept
in a fridge for the past ten years. I'll be using it for the first
time tomorrow. If there is fogging, how much benzotriazole should I
add per liter of Dektol 1:2. The "Darkroom Cookbook" says that
Benzotriazole does not dissolve readily in cold water. It says to
dissolve in hot water ... 125°F/51.67°C or higher. Should I heat up
the water before diluting the Dektol or can the Dektol dilute
solution be heated up and then adding the Benzotriazole?
Any and all recommendations are welcome.
Cheers,
Bogdan
Here is something I found in my archives. Source is Richard Knoppow,
of course.
/quote
"Alfred Lorona" <w6wqc@xxxxxxxxxxxxxx> wrote in message
news:au3hms$3b4gu$1@xxxxxxxxxxxxxxxxxxxxxxxxxx
> >
> > Are benzotriazole pills available anywhere?
> >
> >
AFAIK no longer. Kodak put this up as Antifog NO.1
(Antifog No.2 was 6-Nitrobenzimidazole nitrate).
Benzotriazole is available as a powder. For use make it into
a 0.2% stock solution. At this low concentration it will
dissolve in water.
For fog suppression of outdated material the stock is added
to developer from 20 ml/liter to 40ml/liter for film, and
from 50ml/liter to 500 ml/liter for paper.
--
---
Richard Knoppow
Los Angeles, CA, USA
dickburk@xxxxxxxxxxxxx
unquote/
Thank you Bert, as usual my references are tucked away in boxes.
Eventually I must fix this but it takes other people now because of my
back.
--
Richard Knoppow
Los Angeles, CA, USA
dickburk@xxxxxxxxxxxxx
