From: Sandy King (sanking@CLEMSON.EDU)
Date: 10/01/02-09:28:16 AM Z
Jeffrey D. Mathias wrote:
>
>I do a lot of Pt/Pd printing, both DOP and POP and can tell you that
>both have printout and the self-masking effect. But as Carl (also one
>who has done a lot of Pt/Pd printing) has indicated, there are various
>degrees of printout and self-masking.
My main interest is not whether there is self-masking with POP
platinum, which I would assume there is since the visual printout is
great, but whether or not the amount of self-masking that takes place
in DOP platinum is the cause of the very long toe that is
characteristic of pt/pd curves. In my experience with other processes
the amount of self-masking depends on the intensity of the visual
image that prints out. With salted paper and vandyke you get a great
deal of visual print-out and the impact is very evident in the
shadows. With other processes where there is typically much less
print-out, as in DOP kallitype, the impact on the shadows is much
less. Since there is very little visual print-out in DOP platinum one
would assume that the impact on the shape of a the curve would be
minimal. This is why I have suggested that the long toe of pt/pd
prints, and of kallitypes for that matter, is not due for the most
part to self-masking, but to some other mechanism of the process. If
due to some other mechanism I would like to be able to control it.
Sandy King
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