U of S | Mailing List Archive | alt-photo-process-l | Re: no. of stops in pt/pd and gum etc.-more

Re: no. of stops in pt/pd and gum etc.-more


My commment may have been misleading, since I was thinking more in terms of maximum scale.  Obviously the scale will vary based on chemistry, paper, workflow & humidity.  Maybe the reference you had was in terms of "normal" working ranges, though the figure for gum sounds low, maybe?

Also, I would think that people would often vary the exposure scale for different print characteristics with PT/PD and possibly for gum also.

In a message dated 6/16/07 10:42:26 AM, zphoto@montana.net writes:

Hi all,
I came across an article by an unnamed author :) that said "gum requires a
density of 0.7 or 2 stops and pd of 2.0 or 7 stops. "  These seem low to me
in my experience with either, but  I was wondering in average practice how
many stops you all have found with either process?  I thought pt/pd could
print 10 stops, was I wrong?

Mark Nelson
Precision Digital Negatives
PDNPrint : Precision Digital Negatives
Mark I. Nelson Photography

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