----- Original Message -----
From: "Koch, Gerald" <gkoch02@xxxxxxxxxx>
To: <pure-silver@xxxxxxxxxxxxx>
Sent: Monday, November 28, 2005 1:12 PM
Subject: [pure-silver] Re: D-76 and variations
I was of the understanding that the packaged version was
similar to
D-76d but contained half the amounts of borax and boric
acid. There are
many ways to create the necessary buffer, the use of Kodalk
would just
require more boric acid.
That is possible. Its pretty hard to determine the actual
amounts of anything from the MSDS, only approximate ratios.
In the Carlton and Crabtree paper a lot is made of the
ability to adjust the activity of the developer by varying
the ratio of the buffer components. I think this was aimed
at those developing motion picture film on machines where
the _time_ of development was hard to adjust independantly
of other factors, its hard to know for certain. At the time
the industry was just beginning to use automatic continuous
processing machines and a lot of negative work was still
done on rack-and-tank machines. The increased use of
photographic sound tracks forced the use of machine
processing and very much closer sensitometric control than
had been the practice previously.
---
Richard Knoppow
Los Angeles, CA, USA
dickburk@xxxxxxxxxxxxx
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