[pure-silver] Re: Replacement for Agfa Multicontrast Developer
- From: "Richard Knoppow" <dickburk@xxxxxxxxxxxxx>
- To: <pure-silver@xxxxxxxxxxxxx>
- Date: Sun, 5 Feb 2006 18:44:03 -0800
----- Original Message -----
From: "Nick Zentena" <zentena@xxxxxxxxxxxx>
To: <pure-silver@xxxxxxxxxxxxx>
Sent: Sunday, February 05, 2006 5:27 PM
Subject: [pure-silver] Re: Replacement for Agfa
Multicontrast Developer
On Sunday 05 February 2006 19:47, Richard Knoppow wrote:
Liquid Dektol, sold as Polymax in the US, is too slow
try diluting it less. Try 1:4, which is double the
strength.
The development times and capacity will then be similar
to
the Agfa developer. If you are willing to mix from a
powder
According to the Kodak publication at 1:9 the capacity of
Polymax is 120
8x10s per gallon. The Agfa Multicontrast had a capacity of
about that at 1:4
per litre. My guess is it'll take more then doubling to
get similar capacity.
http://www.kodak.com/global/en/professional/support/techPubs/j5/j5.jhtml?id=0.1.14.34.9.16.6&lc=en#05
Agfa pdfs seem to be gone. But 100 8x10s per litre at 1:4
sounds right. The
stuff really lasts forever.
Nick
I have the Agfa data sheets on file. For Multicontrast
developer 2 data for 2 dilutions are given. For 1+4 the
recommended times are, at 68F
1+4
RC 50 seconds
Baryta 90 seconds
1+6
RC 75 seconds
Baryta 110 seconds
Capacity is given only for 1+4, it is 200 8x10 sheets of RC,
no capacity is given for baryta paper but there is a note
that the capacity depends on how much developer is absorbed
by the paper.
Data for Polymax T developer, which is a liquid
concentrate similar, but not identical, to Dektol shows data
for only one dilution, 1+9.
Time of developement
at 68F
Baryta paper; 45 seconds to 4 minutes.
RC paper; 45 seconds to 3 minutes.
These are the extremes of the range, specific times are
given for various Kodak papers, 1 minute for RC paper and 2
minutes for Baryta paper.
Capacity is given as 120 sheets of 8x10 per gallon
regardless of paper type.
I suspect the capacity of the two developers is similar but
that Kodak's data is more conservative.
Capacity of Dektol at 1:2 is given as 120 8x10 sheets per
gallon with similar developing times.
Richard Henry discovered that Dektol at 1:1 had greater
capacity than at 1:2. Dmax is the same for both dilutions
but becomes less if greater dilution is used.
LPD appears to be very similar to Ilford Bromophen, i.e.,
a conventional paper developer using Phenidone and
Hydroquinone.
The difference between cold and warm tone developers is
mostly activity. However, Agfa Neutol WA appears to be
employ Hydroquinone as the sole developing agent. Such
developers are described in the literature but the old
formulas generally lose a lot of paper speed and are limited
in their Dmax. I suspect the MSDS for Agfa Neutol WA is
incomplete, as are most Agfa MSDS.
I haven't checked Ilford Multigrade developer lately but
it was essentially a liquid version of Bromophen. It was
also sold under a couple of different names in different
parts of the world.
The image color produced by most paper developers can be
modified to some extent by adding either Potassium bromide
(warms it up) or Benzotriazole (cools it down).
The point that I am trying to make is that there is no
magic paper developer. All commercially packaged formulas
are very similar and are mainly of two types: those using
Metol and Hydroquinone, and those using Phenidone and
Hydroquinone. If matched for strength (dilution) there
should be little difference in paper speed, developing
times, image color, or Dmax.
---
Richard Knoppow
Los Angeles, CA, USA
dickburk@xxxxxxxxxxxxx
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