From: Carl Weese (cweese@earthlink.net)
Date: 12/15/02-04:48:55 PM Z
Christina,
Haven't done tests except accidentally, where aged D-76 produced excessive
contrast with 35mm Tri-X developed at accurate time/temp. When I mentioned
encountering this, many years ago on the late-lamented CompuServe
PhotoForum, Arthur Kramer replied that this was a known characteristic of
D-76 when used as a one-shot. Change of Ph caused the developer to become
more active. I don't recall whether it gets more acid or alkaline, but it
raises the contrast. He recommended mixing from scratch instead of package,
the night before use. That seemed a bit excessive, but by making sure I
never let D-76 get more than a month old I got excellent consistency
developing many hundreds of rolls of 35mm Tri-X in D-76 1:1. We intuitively
expect that an old developer would "wear out" and get less active, but
that's not necessarily how the chemicals behave.
---Carl
--
web site with picture galleries
and workshop information at:
http://home.earthlink.net/~cweese/
----------
>From: "Christina Z. Anderson" <zphoto@montana.net>
>To: alt-photo-process-l@sask.usask.ca
>Subject: Re: visualizing; mixing D-76
>Date: Sun, Dec 15, 2002, 5:29 PM
>
> Bear in mind that D-76 has a rather short shelf life and *gains*
>> activity as it ages. It's best to mix only as much as you'll use in a
> couple
>> weeks time.---Carl
>
> Say what???? Please explain as to why and how much activity are we talking
> about in percentages, for instance.
> Chris
>>
>
>
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