[pure-silver] Re: tmx 3200 problem
- From: "Ralph W. Lambrecht" <info@xxxxxxxxxxxxxxxx>
- To: pure-silver@xxxxxxxxxxxxx
- Date: Wed, 30 Dec 2009 09:19:02 +0100
Thanks Richard.
Regards
Ralph W. Lambrecht
http://www.darkroomagic.com
This electronic message contains information that is confidential,
legally privileged or otherwise protected from disclosure. This
information is intended for the use of the addressee only. If you are
not the intended recipient, you are hereby notified that any
disclosure, copying, distribution, printing or any other use of, or
any action in reliance on, the contents of this electronic message is
strictly prohibited. If you have received this communication in error,
please notify the sender and destroy the original message immediately.
P don't print this e-mail unless you really have to
On Dec 30, 2009, at 08:53, Richard Knoppow wrote:
-----Original Message-----
From: "Ralph W. Lambrecht" <info@xxxxxxxxxxxxxxxx>
Sent: Dec 29, 2009 10:05 PM
To: pure-silver@xxxxxxxxxxxxx
Subject: [pure-silver] Re: tmx 3200 problem
Richard
What exactly is dichroic fog?
A deposit of very finely devided silver on the surface of the
film. Its called dichroic because its yellow by transmitted light
and blue or rainbow colored by reflected light. Dichroic fog can be
caused by excessive silver in developers or fixing baths. While its
usually pretty uniform it can form blotches of the sort visible on
these negatives. If this is dichroic fog looking at it by reflected
light will show it up in some color. I am grasping at straws here
but its worth a look.
I've had blotches like this on some very old Plus-X sheet film.
That stuff was jelly like and wiped off while the film was wet. I
have not encountered with with other film, just this one box.
Dichroic fog can be removed using a bleach made of acid rapid
fixer at film strength to which is added about 15grams per liter of
citric acid. This forms a mild silver bleach. Because the dichroic
fog is made of such fine particles it will dissolve before the image
but the bleach needs to be used with care because it _can_ and will
reduced the image if used for too long.
It is also possible that this is a manufacturing defect. Have
you any other film from the same lot number? If its not dichroic
fog I would check with Kodak.
--
Richard Knoppow
dickburk@xxxxxxxxxxxxx
Los Angeles, CA, USA
=
=
=
=
=
=
=
=
=
=
=
=
=
=
=
=
=
=
=
=
=
=
=
=
=
=
=
=
=
=
=
=
=
=
=
=
=
=
=
======================================================================
To unsubscribe from this list, go to www.freelists.org and logon to
your account (the same e-mail address and password you set-up when
you subscribed,) and unsubscribe from there.
Other related posts:
