true B&W roller transport processing

I have a 20 inch Colenta RA4 roller transport processor. I'm interested
in setting it up to process black and white prints. Can this be done?
Are there chems out there for this type of work?

Thanks,

Eric

I tried this with my Durst Printo -- you can change the cogs to various
processing speeds -- Ilford had a white-paper on using more concentrated fix
solutions and shorter processing times.

My experience was that it "worked", but I thought using trays to be more
economic. To really get the maximum black out of a print it seems to take 2
minutes of development time.

At least with the roller processor you can maintain a constant temperature.

"Eric Palmer" wrote in message
ups.com...
I have a 20 inch Colenta RA4 roller transport processor. I'm interested
in setting it up to process black and white prints. Can this be done?
Are there chems out there for this type of work?

Thanks,

Eric

John Walton wrote:
I tried this with my Durst Printo -- you can change the cogs to various
processing speeds -- Ilford had a white-paper on using more
concentrated fix solutions and shorter processing times.

My experience was that it "worked", but I thought using trays to be
more economic. To really get the maximum black out of a print it seems
to take 2 minutes of development time.

At least with the roller processor you can maintain a constant
temperature.

I maintain a constant temperature for Black and White prints by allowing
the overflow from my Zone VI print washer to overflow into my preliminary
washing sink. From there, it overflows into my processing sink where my 5
trays are. No extra water required for these constant temperature baths.

--
.~. Jean-David Beyer Registered Linux User 85642.
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"Eric Palmer" wrote in message
I have a 20 inch Colenta RA4 roller transport processor. I'm interested
in setting it up to process black and white prints. Can this be done?
Are there chems out there for this type of work?

There is (was?) a technique called 'stabilization processing'. It used a
cheap 2 bath processor and delivered a damp print in ~15 seconds. Popular
with newspapers in the old days. Prints faded in a month or so unless
washed. Max black was a dark muddy grey. Ditto max white.

There are 'Rapid RC' papers that have developer incorporated into
the emulsion and develop in under 30 seconds.

As usual: Google knows.

--
Nicholas O. Lindan, Cleveland, Ohio
Consulting Engineer: Electronics; Informatics; Photonics.
To reply, remove spaces: n o lindan at ix . netcom . com
psst.. want to buy an f-stop timer? nolindan.com/da/fstop/

"Eric Palmer" wrote in message
I have a 20 inch Colenta RA4 roller transport processor. I'm interested
in setting it up to process black and white prints. Can this be done?
Are there chems out there for this type of work?

There is (was?) a technique called 'stabilization processing'. It used a
cheap 2 bath processor and delivered a damp print in ~15 seconds. Popular
with newspapers in the old days. Prints faded in a month or so unless
washed. Max black was a dark muddy grey. Ditto max white.

There are 'Rapid RC' papers that have developer incorporated into
the emulsion and develop in under 30 seconds.

As usual: Google knows.

--
Nicholas O. Lindan, Cleveland, Ohio
Consulting Engineer: Electronics; Informatics; Photonics.
To reply, remove spaces: n o lindan at ix . netcom . com
psst.. want to buy an f-stop timer? nolindan.com/da/fstop/

"Jean-David Beyer" wrote in message
...
John Walton wrote:
I tried this with my Durst Printo -- you can change the cogs to various
processing speeds -- Ilford had a white-paper on using more
concentrated fix solutions and shorter processing times.

My experience was that it "worked", but I thought using trays to be
more economic. To really get the maximum black out of a print it seems
to take 2 minutes of development time.

At least with the roller processor you can maintain a constant
temperature.

I maintain a constant temperature for Black and White prints by allowing
the overflow from my Zone VI print washer to overflow into my preliminary
washing sink. From there, it overflows into my processing sink where my 5
trays are. No extra water required for these constant temperature baths.


Let me chime in with my ignorance--what does the difference in temps mean to
print developing? I carefully control my film development temps, but pretty
much let the trays fall wherever (usually 65-75 degrees, over the course of
a year). I'm not having any problems, per se, but I'm a pretty casual dark
room user at this point.
Thanks

--
Regards,
Matt Clara
www.mattclara.com

Eric Palmer wrote:
I have a 20 inch Colenta RA4 roller transport processor. I'm interested
in setting it up to process black and white prints. Can this be done?
Are there chems out there for this type of work?


How many baths on the processor?

Agfa Multicontrast I think is intended for machine use. RA-4 is 45 seconds
for dev and blix. Agfa Multicontrast with RC paper is 60 seconds at normal
B&W temps. I forget how fast rapid fix is but you could always finish fixing
in a tray.

Nick

Matt Clara wrote:

Let me chime in with my ignorance--what does the difference in temps mean to
print developing? I carefully control my film development temps, but pretty
much let the trays fall wherever (usually 65-75 degrees, over the course of
a year). I'm not having any problems, per se, but I'm a pretty casual dark
room user at this point.
Thanks

The way I print, it matters little what the actual temperature is, though
my processing temperatures are never less than about 75F. What does matter
is that the temperature for a given day not change too rapidly, and
keeping my trays in a sink with the wash water overflow (supplied by a
temperature regulating valve) has enough thermal mass that the
temperatures cannot change rapidly.

The reason it matters little is that I always develop for the same time (2
minutes for D-72 1+2, 3 minutes for Ansco 113 -amidol), and adjust
exposure of the print so the maximum black is produced. So the exposure of
a print is implicitly calibrated for the developer temperature. The
temperatures for the other baths do not matter much, provided they not get
too cold, where the fixing might not work fast enough. It happens that all
my baths are within 1F, but with papers hardened, this is probably of much
less concern than with old unhardened films (if you can even get those
anymore).

--
.~. Jean-David Beyer Registered Linux User 85642.
/V\ PGP-Key: 9A2FC99A Registered Machine 241939.
/( )\ Shrewsbury, New Jersey http://counter.li.org
^^-^^ 10:25:00 up 42 days, 18:42, 5 users, load average: 1.15, 1.06, 1.01

Nicholas O. Lindan wrote:
"Eric Palmer" wrote in message

I have a 20 inch Colenta RA4 roller transport processor. I'm interested
in setting it up to process black and white prints. Can this be done?
Are there chems out there for this type of work?


There is (was?) a technique called 'stabilization processing'. It used a
cheap 2 bath processor and delivered a damp print in ~15 seconds. Popular
with newspapers in the old days. Prints faded in a month or so unless
washed.

Actually, they would deteriorate even faster if washed. They needed to be
fixed and washed to preserve them longer.

If not fixed and washed, they had to be kept separate from conventional
prints as the residual fixing agents in the paper would seriously
contaminate any surface with which they came in contact.

Max black was a dark muddy grey. Ditto max white.

There are 'Rapid RC' papers that have developer incorporated into
the emulsion and develop in under 30 seconds.

As usual: Google knows.



--
.~. Jean-David Beyer Registered Linux User 85642.
/V\ PGP-Key: 9A2FC99A Registered Machine 241939.
/( )\ Shrewsbury, New Jersey http://counter.li.org
^^-^^ 10:30:00 up 42 days, 18:47, 5 users, load average: 1.10, 1.08, 1.02

Nick Zentena wrote:

How many baths on the processor?

Agfa Multicontrast I think is intended for machine use. RA-4 is 45
seconds
for dev and blix. Agfa Multicontrast with RC paper is 60 seconds at
normal
B&W temps. I forget how fast rapid fix is but you could always finish
fixing
in a tray.

Nick

Three bath tanks. I'm just wondering if I'm over looking something. I
plan on slowing the dev time to 120 sec and keeping the temp around 21
Celsius. Does anyone know what the replenisment setting might be like?
Should the drying time be a concern? Is there a big difference in
drying times for B&W RC paper and RA4 paper?

Thanks for the replys,

Eric