From: Eric Neilsen (e.neilsen@worldnet.att.net)
Date: 09/13/02-07:12:12 AM Z
Shannon, You may also be seeing the affect of evaporation of your tray.
Did you take a temperature reading before and after the sheet was placed
in the tray? There can be quite a shift in tray temperature over a 15
to 20 minute development. Type of trays, the construction material used
for sink, air flow in the darkroom, will all have an impact on tray
processing that should not be over looked when you encounter such large
changes in process time. This is also another reason to use distilled
or purified water for mixing developers, a reasonably constant quality
of water.
Eric Neilsen Photography
4101 Commerce Street
Suite 9
Dallas, TX 75226
http://e.neilsen.home.att.net
http://ericneilsenphotgraphy.com
-----Original Message-----
From: shannon stoney [mailto:sstoney@pdq.net]
Sent: Friday, September 06, 2002 9:40 AM
To: alt-photo-process-l@sask.usask.ca
Subject: water affecting development; washing big negatives
I am developing film in Houston now, and I have noticed that
development goes much faster here than in TN. Could this be because
of water differences? In Tn I had to use D76 straight on TriX, and
sometimes I had to develop for as much as 20 minutes to get the
highlights to about 1.9 or 2.0. Here in TX, yesterday, I got the
highlights up to 2.3 (too high for my purposes) with D76 diluted 1:1
in 15 minutes. The water is a bit warmer here, but in TN I warmed the
cooler water up to see if I could get the developer to work faster
too. Yesterday I developed at about 75 degrees (with the help of
some ice cubes).
I am wondering if the calcium in the water in TN slows D76 down.
Maybe in the future I should use distilled water when I make the
stock solution and then again when I dilute the stock solution?
Or do we just have so many chemicals in our Houston water that they
sort of help D76 along?
The other question has to do with washing big negatives. I put them
in a tray in the bathtub and run cold water into the tray for about
ten minutes. Occasionally I come in the bathroom and shuffle them (I
do two at a time). Is this good enough? When I come to check they
are usually stuck together, so I wonder if they are getting enough
clean water around them. But it seems tedious to sit there and
shuffle them the whole time; however, not that much more tedious than
rolling the tubes in the tempered water.
--shannon
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