[pure-silver] Re: D-76 and variations
- From: Christopher Woodhouse <chris.woodhouse@xxxxxxxxxxxx>
- To: <pure-silver@xxxxxxxxxxxxx>
- Date: Tue, 29 Nov 2005 17:19:06 +0000
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
>
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--
Regards Chris Woodhouse
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