Re: Measuring Pt/Pd Negative Density Ranges

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From: Tom Ferguson (tomf2468@pipeline.com)
Date: 06/25/00-03:15:24 PM Z

Many have (correctly) stated that an absolute answer is impossible due to
about "A Million" variables. Absolutely true!! But I'll give you my range,
based on DOP style, Cranes Platinotype paper, 50/50 plat/pallad and Ammonium
Citrate developer. These numbers assume a UV tube type light source and
"density range" is from barely detailed shadows (zone 2) to barely detailed
highlights (zone 8).

All #1, no #2: density range = 1.6, exposure time = 11:30
Half #1, half #2: density range = 1.35, exposure = 13:00
No #1, all #2: density range = 1.1, exposure = 15:30
               (and a bit of "grain" in the print)

Again: these are my numbers, and will certainly be different for others! 

-- 
Tom Ferguson
http://www.ferguson-photo-design.com

> From: Steve Shapiro <sgshiya@redshift.com>
> Subject: Measuring Pt/Pd Negative Density Ranges
>
> Now, we're finally getting to the heart of the matter.
> 
> I have a Kodak density sheet that tells the contrast range for silver
> gelatin, grades of papers.
> 
> 1= 120- 95
> 2=  95- 80
> 3=  80- 65
> 4=  65- 40
> 5=  40- 30 and 30 is unprintable.
> 
> Mostly, base + fod is 17 to 12 min.
> 
> 
> Now:  What I would like to know, by guess, experience or extimate; what are
> the print ranges for Pt/Pd i.e.drops [recommended] for each density
> measurement?
> 
> Steve Shapiro, Carmel, CA

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