Re: Kodalith fine line developer formula (sort of)

From: Ryuji Suzuki ^lt;>
Date: 11/23/04-11:49:12 AM Z
Message-id: <>

From: Nick Zentena <>
Subject: Re: Kodalith fine line developer formula (sort of)
Date: Tue, 23 Nov 2004 10:53:22 -0500

> Okay. So the developers that leave out both are no worse then
> those that contain them. The formaldehyde binds the sulfite. The
> sulfite doesn't provide anything to the Lith effect. OTOH the Lith
> formulas that contain just the sulfite should be avoided.

Formaldehyde and sulfite do not make free sulfite to be zero. They
make an equilibrium working as a sulfite buffer, amounting free
sulfite to equivalent of a couple of grams per liter. I have posted a
developer calle "Burning Lithprint developer" in old pure-silver list,
which contains a couple grams of sulfite, bromide and hydroquinone, in
a solution buffered with trisodium phosphate. It's a very active
developer for lith printing, but has very short life unless a gram of
sulfite is added periodically, because of no sulfite reservoir. Yet I
can get a few prints out of each liter of the solution. The idea is to
have active solution ready for one-shot use to eliminate the guesswork
associated with old brown.

Hydroquinone-only classic lith developers are becoming
obsolete. Modern lith film/developer system use contrast enhancing
agents (hydrazine compounds) for true infectious development. But then
lithographic films are getting obsolete as well.

Ryuji Suzuki
"People seldom do what they believe in.  They do what is convenient,
then repent." (Bob Dylan, Brownsville Girl, 1986)
Received on Tue Nov 23 11:49:25 2004

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