From: Eric Neilsen (e.neilsen@worldnet.att.net)
Date: 11/25/01-08:59:37 PM Z
Jeff, There seems to be many things left unsaid by you about your whole set
up.
FO should be well mixed and will take hours (pushing it) and a day or so to
fully dissolve. It will last many many months. Mixing it fresh is a
problem, not only to get it mixed, but weight properly the same for small
batches. If you are using AFO, that is a different animal.
Are you drying your paper? dry palladium paper or one with a low RH is
slower than a humidified paper?
Is the film printing full range? 80 minutes seems quite long. How much
dichromate in your developer? this will also slow your print times.
What are your times for a non pyro negative?
EJ Neilsen
----- Original Message -----
From: "Jeff Buckels" <jeffbuck@swcp.com>
To: <alt-photo-process-l@usask.ca>
Sent: Sunday, November 25, 2001 10:04 AM
Subject: Dense or Density
> Hello from Albuquerque NM. This is my first posting to this fine
> list....
>
> I've started doing platinum/palladium. Have done two sessions in my
> newly up and running home rig. I'm excited by the results I'm getting
> but am plagued by preposterously long exposures. Here's what I do: I'm
> shooting FP4+ (5x7 and 8x10) @ EI 64, erring on the side of
> over-exposure. Nothing fancy as to reading; for the time being, to keep
> it simple, I'm just doing split readings (mostly between the darkest and
> lightest readings on the palm of my hand), leaving any particular
> contrast control to the printing stage. I'm developing the film in PMK
> for 12 minutes at 70F. All exposures, regardless. The printing is on
> Platine. I've done a couple prints with pure palladium, a couple with
> about 55/45 Pt to Pd, adding some contrast on one occasion with a small
> amount of sodium dichromate in the pot/oxalate developer. The color and
> contrast need tweaking but I'm happy with both. The exposure times are
> an outrage: From 20 to 80 minutes. I can live with 20, and I
> understand there's only 2 stops difference between that and 80, but most
> the exposures are over 50. The light source is a new "oven" from
> Edwards, which I feel is working correctly. Can anyone tell me if
> anything jumps out of the above procedure as the likely repeat cause of
> these pokey exposures?? I'd sure like to stick with Pyro and know that
> that is the principal culprit. But, you know, if I could just get to
> 15-20 minute exposures, I'd be satisfied.... Thank you.
>
> jeff buckels (albuquerque nm)
>
>
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