[pure-silver] Re: PMK was Re: Tri X film versions and sizes
- From: "Koch, Gerald" <gkoch02@xxxxxxxxxx>
- To: <pure-silver@xxxxxxxxxxxxx>
- Date: Thu, 17 Feb 2005 15:24:14 -0500
This is what Mason comments when discussing the graph for PQ developer.
How do we define optimal? Do we want the fastest development time,
fastest film speed, ... ? I was using the term optimal in an overall
sense. Lacking any firm data about the superadditivity of Metol and
pyro we really can't say anything for certain. We are like the men in
the old fable arguing about how many teeth a horse has without
endeavoring to look.
>We need to remember that the optimal point of superadditivity is when
we get=20
>the most development for the least amount of developing agent.
I think what you intend is the *fastest* development rate.
Superadditivity cannot change the amount of silver reduced only the rate
of reduction.
-----Original Message-----
From: pure-silver-bounce@xxxxxxxxxxxxx
[mailto:pure-silver-bounce@xxxxxxxxxxxxx] On Behalf Of Jim MacKenzie
Sent: Thursday, February 17, 2005 12:25 PM
To: pure-silver@xxxxxxxxxxxxx
Subject: [pure-silver] Re: PMK was Re: Tri X film versions and sizes
----- Original Message -----=20
From: "Koch, Gerald" <gkoch02@xxxxxxxxxx>
To: <pure-silver@xxxxxxxxxxxxx>
Sent: Thursday, February 17, 2005 11:03 AM
Subject: [pure-silver] Re: PMK was Re: Tri X film versions and sizes
> No, but the superadditive effect is overshadowed by the large amount=20
> of pyro in comparison to the Metol.
We need to remember that the optimal point of superadditivity is when we
get=20
the most development for the least amount of developing agent. This is
not=20
necessarily the most desirable form of development as a different ratio
of=20
developing agents may give us superior tonality, acutance, shadow
detail,=20
etc. Optimum superadditivity is an issue of chemical efficiency, not=20
quality of results. The two may or may not coincide.
Jim=20
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=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
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