[pure-silver] Re: archival wash in cold water?
- From: "Richard Knoppow" <dickburk@xxxxxxxxxxxxx>
- To: <pure-silver@xxxxxxxxxxxxx>
- Date: Sat, 16 Apr 2011 13:05:36 -0700
----- Original Message -----
From: "Eric Nelson" <emanmb@xxxxxxxxx>
To: <pure-silver@xxxxxxxxxxxxx>
Sent: Saturday, April 16, 2011 12:51 PM
Subject: [pure-silver] Re: archival wash in cold water?
That's what I understand as well. Also, Richard has
mentioned and I've
experienced that insufficient washing will be detected by
sepia toning and show
up as white spots once toned. I'm using the thiocarbamide
version.
Ahh, plumber was apologetic for his tardiness and only
charged $100+ lunch and
in a rare occurrence the install went unbelievably smoothly
with the new unit
fitting in w/very little effort needed. Around here that
has rarely happened!
e
I am pretty sure that wash water temperature was covered
in research pulbished by Kodak in the 1930's. They published
a lot of stuff on fixing and washing around that time. Kodak
labs could make printing paper or film as desired. One paper
I remember experimented with wash times for the paper
support itself without any coatings and with just the baryta
coating. I may be able to find the citations but I think the
material was covered in Mees's _Theory of the Photographic
Process_.
Kodak and AGFA knew about the use of alkaline baths to
speed up washing at that time but not about the ion-exchange
properties of sulfites.
Washing gets very slow at low temperatures. High
temperature washing was also known but the emulsions of the
time were too soft to permit really high temperatures even
when hardened with chrome alum. In any case, chrome alum
tends to stain the emulsion. This is not important for film
but makes the stuff difficult to use for prints. Chrome alum
hardeners were used mostly for tropical processing.
--
Richard Knoppow
Los Angeles, CA, USA
dickburk@xxxxxxxxxxxxx
=============================================================================================================
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:
