Sandy,
What is a continuous wave xenon? And congrats on your new full time job
(photography?)
Marek, Houston
>From: Sandy King <sanking@clemson.edu>
>Reply-To: alt-photo-process-l@usask.ca
>To: alt-photo-process-l@usask.ca
>Subject: AmerGraph ULF-28
>Date: Thu, 01 Jun 2006 15:27:52 -0400
>
>
>This is a brief update on my experience with the Amer-Graph ULF-28 printing
>unit. For those who may not have seen my first message about this unit, it
>is a Continuos Wave Xenon plate maker, similar in size and configuration to
>the NuArc 261k and 261ks. This is a prototype unit which was sent to me by
>Amer-Graph for testing purposes.
>
>Over the past several weeks I have tested the ULF-28 with several printing
>processes, including palladium, cyanotype, palladium and carbon, comparing
>the results with my bank of BL fluorescent tubes. Papers used were
>Stonhenge and COT 320. With every process, when using the same paper, the
>ULF-28 prints a full 1.5 stops faster than the BL bank.
>
>For example, take the following situation.
>
>1. Pure palladium on COT 320.
>2. Double Coating, using 2 ml of a 1:1 mixture of 15% palladium chloride
>and 25% ferric oxalate for both coatings. Short blast with hair dryer after
>both coatings to keep the solution on the surface.
>3. Dry for 15 minutes, with air from fan.
>4. Exposure with a Stouffer TP 4X5 step wedge
>5. Development in a 25% solution of potassium oxalate, with 2ml of a 5%
>solution of potassium dichromate added per liter of developer for contrast
>control.
>6. Workroom at 72ºF, RH 52%.
>
>Best exposure for the ULF-28, as judged by the first maximum density that
>merges with the next one, was 50 units, where one unit = 1.3 seconds, for a
>total time of 65 seconds.
>
>Best exposure for the BL bank, similar evaluation, was 200 units, where one
>unit = .98 seconds, for total time of 196 seconds.
>
>The ES of palladium, as processed above, was 12 steps (of log .15 each)
>from maximum density to paper white, or about 1.80.
>
>I will be doing a full review of this unit for publication later this
>summer. Hoped to have it done by now but have been delayed due to
>complications from eye surgery.
>
>Sandy
Received on 06/02/06-07:45:44 AM Z
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