[pure-silver] Re: D-76 and variations
- From: DarkroomMagic <info@xxxxxxxxxxxxxxxx>
- To: PureSilverNew <pure-silver@xxxxxxxxxxxxx>
- Date: Tue, 29 Nov 2005 19:34:59 +0100
Unfortunately this test does not investigate the difference between D76 and
ID11.
I thought how to set up a test like this, but can¹t think of how to control
the many variables of such a long-term test (I like to do it over 18
months). Film will age over that time, and the exposure might not be
consistent either.
I¹m wondering if it would be better to do all the required exposures at the
same time, freeze the exposed film and just pull the individual sheets out
of the freezer as required.
Does anyone know some facts about latent image stability of frozen film?
Regards
Ralph W. Lambrecht
http://www.darkroomagic.com
On 2005-11-29 18:19, "Christopher Woodhouse" <chris.woodhouse@xxxxxxxxxxxx>
wrote:
> I found this article on the practical storage performance of various D76
> derivatives: http://www.udmercy.edu/crna/agm/phenvitc.htm
>
> It is well written and laid out, so we can make our own judgement on the
> experimental thoroughness and repeatability.
>
> Interestingly, it throws suspicion on plastic containers wrt D76 keeping
> qualities.
>
>
> On 28/11/05 23:25, "Richard Knoppow" <dickburk@xxxxxxxxxxxxx> wrote:
>
>>
>> ----- Original Message -----
>> From: "Koch, Gerald" <gkoch02@xxxxxxxxxx>
>> To: <pure-silver@xxxxxxxxxxxxx>
>> Sent: Monday, November 28, 2005 1:12 PM
>> Subject: [pure-silver] Re: D-76 and variations
>>
>>
>> I was of the understanding that the packaged version was
>> similar to
>> D-76d but contained half the amounts of borax and boric
>> acid. There are
>> many ways to create the necessary buffer, the use of Kodalk
>> would just
>> require more boric acid.
>>
>> That is possible. Its pretty hard to determine the actual
>> amounts of anything from the MSDS, only approximate ratios.
>> In the Carlton and Crabtree paper a lot is made of the
>> ability to adjust the activity of the developer by varying
>> the ratio of the buffer components. I think this was aimed
>> at those developing motion picture film on machines where
>> the _time_ of development was hard to adjust independantly
>> of other factors, its hard to know for certain. At the time
>> the industry was just beginning to use automatic continuous
>> processing machines and a lot of negative work was still
>> done on rack-and-tank machines. The increased use of
>> photographic sound tracks forced the use of machine
>> processing and very much closer sensitometric control than
>> had been the practice previously.
>>
>> ---
>> 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:
