>Dick I think it's possible that platinum/palladium and kallitype coat
>differently. My sense of the situation, my *recollection* (I haven't done
>either for several years) is that the pl/pd makes a syrupy concoction, the
>kallitype more liquid like VDB. It, I believe, will soak into the paper
>more, and can, therefore, get greater D-max by coating heavy.
Soaking into the paper will tend to reduce the D-max as the paper will get
between you and the image. The only difference between practical
application of the solutions is that the pt/pd solutions are more expensive
than the others so one tends to be more careful.
>I've noticed in cyanotype, BTW (haven't made these tests in other media),
>that, as I have mentioned, with some papers double coating increases
>D-max, with others it decreases, wiping off emulsion.
Double coating or double processing ( doing the whole thing twice) can
increase the density range in cyanotype prints from weak negatives.
>I've never seen solarizing in platinum, but I have seen it in cyanotype,
>where it doesn't at all become paper white, but a lighter blue.
In a cyanotype you expose until all the shadows are solarised. Then you
know that it is done properly. The solarised parts turn dark blue on
development.
Terry
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