[pure-silver] Re: PMK was Re: Tri X film versions and sizes
- From: Ryuji Suzuki <rs@xxxxxxxxxxxxxxx>
- To: pure-silver@xxxxxxxxxxxxx
- Date: Thu, 17 Feb 2005 13:09:09 -0500 (EST)
From: "Koch, Gerald" <gkoch02@xxxxxxxxxx>
Subject: [pure-silver] Re: PMK was Re: Tri X film versions and sizes
Date: Thu, 17 Feb 2005 12:03:51 -0500
> AKAIK, the regular definition; that the activity of the two agents
> combined is greater than the sum of their individual activities.
AFAIK, that's not the regular definition; the regular definition uses
the rate of development as the criteria. "Activity" is too vague.
> The optimum ratio can be determined by plotting the activity of various
> mixtures. Data and graphs appear in Mason where he gives weight ratios
> and molar ratios for Metol/hydroquinone and Phenidone/hydroquinone
> combinations.
And what kinds of variables can influence on the location of the maxima?
Is the "optimal ratio" property of the developing agent?
> As I stated, I have not seen any data as to the superadditivity of Metol
> and pyro.
In terms of modern classification of developing agents, what are the
criteria for agents to be superadditive?
--
Ryuji Suzuki
"Keep a good head and always carry a light camera."
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