I did some extensive printing in Van Dyke brown (VDB) about 20 years ago.
Not to be tooting my whistle, check out:
http://www.bostick-sullivan.com/vandyke.htm
This is only so folks can see what we are talking about when we talk about
VDB prints.
BTW I consider it to be true solarization and not Sabattier effect that
occurs in silver printing when Bostick opens the door to the darkroom and I
have a print in the developer. Sabbatier is I think more complicated as it
occurs during development. Solarization occurs only during exposure.
An interesting note is that the Ziatype is immune to solarization. Well
almost, I believe I saw some slight indication of it on some step wedge
tests that Carl and I ran for our book, but they were at such ridiculously
long exposures as to be out of range for any normal printing. If I remember
-- gads am I fading this fast!-- the time was in the hours where the normal
print time would have been 3 to 5 minutes.
--Dick
>The question I have in this discussion, as someone who has not yet
>explored the delights of VDB, is this: is the "bronzing" of VDB under
>discussion identical with, similar too, or a completely different
>phenomenon from, the "solarization" of Pt/Pd prints, most commonly seen
>in pure palladium develop-out prints, and associated with the deepest
>image tones, which not only go brown but "reverse out" in tonality?
>
>---Carl
>
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