Carl Weese (cjweese@wtco.net)
Sun, 21 Mar 1999 13:33:50 -0500
Nze,
I haven't tried those new "exotic ferrics" but have now worked a lot
with lithium and sodium ferric, touched on briefly in TNPP.
Sodium ferric warms the highlights in a yellowish direction and gives a
significant contrast increase compared to ammonium ferric. It can be
used alone or mixed with afo. Lithium ferric is very different in color,
and its color changes dramatically depending on the paper. It generally
goes toward red, and can be used up to about 50/50 with afo. Above that
it tends to suddenly go gritty and harsh. Platinotype gets subtle warmth
at 20% lfo, more warm at 50%. Arches Platine colors much more strongly,
getting about as warm as a standard all-palladium develop-out print at
30% lof. 50/50 goes really *red*. I imagine other papers will show more
different results. This seems to be a highly variable ingredient, though
with a particular paper and formula it seems consistent and repeatable.
LFO shelf life seems excellent, like AFO. The SFO gains lots of contrast
after a few months of storage.
---Carl
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