Archived posting to the Leica Users Group, 2005/07/18

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Subject: [Leica] over fixed?
From: jblack at ambio.net (John Black)
Date: Mon Jul 18 13:22:38 2005
References: <8FA056F3-D483-468F-B462-E05E47CCA01E@earthlink.net> <9b678e0507161922bdf1804@mail.gmail.com>


> Feli,
> You will lose the delicate almost unexposed parts of the film, or the
> near whites if it is a print.  Without comparison you will never know
> that they are gone.  Best to fix by time, you know the twice the time
> it takes to clear rule.
>
> Don

I got concerned one time about whether I was loosing any shadows to over
fixing and so I did a little experiment.  Since I was using neutral rapid
fix (ammonium thiosulphate at pH 7.1), that's all I have data on.  I exposed
several rolls of Tri-X at zones I-X and developed them identically.  I then
fixed for times ranging from 2X clearing up to 10 min.  I was surprised to
find, after measuring the densities on a densitometer, that there was no
loss of density in the toe of Tri-X (zones I-III) regardless of how long I
fixed the film. I have not tried this on paper.

My clearing times with film are mostly about 25-35 seconds but I cannot
stand to only fix for one minute so I fix as a standard practice for 3 min
with a 3 min wash aid (mostly to help get rid of the dye).

Reasonable fixation times of 2-3 min in neutral rapid fixer will not degrade
the image shadows.

JB




Replies: Reply from lmc at interlink.es (Luis Miguel Castañeda) ([Leica] over fixed?)
Reply from don.dory at gmail.com (Don Dory) ([Leica] over fixed?)
In reply to: Message from don.dory at gmail.com (Don Dory) ([Leica] over fixed?)