[pure-silver] Re: How Critical Is Wash Water Temperature
- From: "Richard Knoppow" <dickburk@xxxxxxxxxxxxx>
- To: <pure-silver@xxxxxxxxxxxxx>
- Date: Mon, 7 Apr 2014 11:53:23 -0700
----- Original Message -----
From: "Laurence Cuffe" <cuffe@xxxxxxx>
To: <pure-silver@xxxxxxxxxxxxx>
Sent: Monday, April 07, 2014 4:10 AM
Subject: [pure-silver] Re: How Critical Is Wash Water
Temperature
I used to be quite precise about this following advice in
various technical books, but I gradually grew more casual
about the wash water temperature as I found it did not seem
to make a difference.
This came back and bit me when I tried to develop an image
on a glass plate, and there was about a 10 degree difference
in the wash water temperature.
The image gelatin just peeled off the glass plate. This
turns out to be one of the classic ways to develop
Reticulation. I don't know that this is what caused it, but
my I felt that this behavior was probably the reason that
that advice was given so often in older books.
All the best
Laurence Cuffe
At the time the books of the 1930s were written the
emulsions used were much softer and I am not sure the
binders were that good. It was easy to cause reticulation
and frilling. More recent emulsions are very hard and are
made partially with materials other than gelatin. I have
tried to delibrately reticulate negatives with very little
success. On modern film it takes virtually boiling water to
accomplish it. But any sort of old fashioned emulsion is
quite vulnerable.
--
Richard Knoppow
Los Angeles
WB6KBL
dickburk@xxxxxxxxxxxxx
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