[pure-silver] Re: PMK was Re: Tri X film versions and sizes
- From: Ryuji Suzuki <rs@xxxxxxxxxxxxxxx>
- To: pure-silver@xxxxxxxxxxxxx
- Date: Wed, 16 Feb 2005 17:20:18 -0500 (EST)
From: "Koch, Gerald" <gkoch02@xxxxxxxxxx>
Subject: [pure-silver] Re: PMK was Re: Tri X film versions and sizes
Date: Wed, 16 Feb 2005 15:52:26 -0500
> Even so the superadditivity ratio of Metol to
> hydroquinone is around 1:3 or 1:4 and I would suspect that it would be
> in the same range for pyro.
What's your definition of superadditive and "superadditive ratio?"
> In PMK the ratio is 1:20 which does not appear to be optimum.
Does that make it non-superadditive?
> Metol has traditionally been added in small amounts to pyro
> developers to improve shadow detail and gradation. Any synergy
> between Metol and pyro in PMK is a lagniappe.
Does that make metol-pyrogallol non-superadditive?
--
Ryuji Suzuki
"Keep a good head and always carry a light camera."
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