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

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

Good, Mark, that's what I thought...I mean, it can do a 31 step tablet with enough humidity I thought I heard somewhere, so I was surprised with this piece of info. But what do you think might be its maximum "stoppage"?
----- Original Message ----- From: <Ender100@aol.com>
To: <alt-photo-process-l@usask.ca>
Sent: Saturday, June 16, 2007 2:58 PM
Subject: Re: no. of stops in pt/pd and gum etc.

Hi Chris,

PD can go beyond 10 stops.

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

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?

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