William Laven (wmlaven@platinotype.com)
Sat, 20 Feb 1999 16:35:45 -0800 (PST)
>In practice I don't use the rollo formula at 1:2:50 (except for
>contrast-resistent HP5+) as recommended by Harald but find I do better
>with TXT and BPF 200 with 1:2:75 and with FP4+ at 1:2:100.
>
>I think you are right that rollo gives a steeper curve in the
>highlights, but this is actually a benefit for Ziatype printing without
>contrast agents to take full advantage of the system's self-masking
>properties.
And how about with Pt/Pd? Is it harder to control the contrast in the
highlights or are they still manageable?
With some regular-PMK-in-Jobo negs (FP4) I recently made, I was able to
print them with a nearly-free-of-contrast-agent paper and liked the full
use of the loooong scale paper, but the highlights weren't terribly
contrasty and so I'm wondering whether rollo-pyro negs with much more
highlight contrast would just be too hot for Pt/Pd since it lacks the
thorough self-masking charcteristics of POP.
What have you found w/rollo pyro and Pt/Pd in the highlights?
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WILLIAM LAVEN PHOTOGRAPHY
Workshops and tutorials in Platinum/Palladium printing and Zone System.
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