[pure-silver] Re: AW: Re: Any advice for purchase of densitometer.
- From: Sandy King <sanking@xxxxxxxxxxx>
- To: pure-silver@xxxxxxxxxxxxx
- Date: Fri, 24 Dec 2004 17:52:05 -0500
John,
Your comment proves that the problem for VC papers is very, very
complicated. My own tests in comparing VC and graded papers have been
done by contact printing, using as a light source a Beseler 23-CII
with the original incandescent bulb. With this set-up I see about the
same difference between VC and graded papers observed by Mr. Thornton.
However, to be quite frank, I have not observed as much difference in
contrast between graded and VC papers between the stain of
pyocatechin based developers (Diaxactol, Pyrocat-HD) and pyrogallol
based developers (PMK, Rollo Pyro, WD2D+). It is possible that Mr.
Thornton exaggerated the differences to promote sales of his own
developer, but based on the differences in our own observations I
think it is also possible, perhaps even more likely, that his
printing light sources gave those results.
Sandy
>At 08:14 AM 25/12/2004, Sandy wrote:
>
> >One of the things that folks need to understand about negatives
>>developed in pyro staining developers, however, is that for printing
>>on VC papers the negative must be developed to a much higher contrast
>>than if printing on graded silver papers. I have found, for example,
>>that a PMK or Pyrocat-HD negative that will print well on a silver #2
>>graded paper will need a #4 or perhaps even a #5 VC filter to print
>>with the same effective contrast on VC papers.
>
>This was Barry Thornton's criticism, i.e. for roll film sizes the increased
>development produced sufficient grain to negate much of the benefit of
>pyrogallol. He then formulated a pyrocatechol developer which he claimed
>reduced this effect.
>
>I'm wondering if my Zone VI 2-tube VC head is producing some UV, since i
>don't find anywhere near this often quoted difference between graded and VC
>paper. On the other hand, although my PMK negs looked distinctly
>different to non-stained negs, they never looked as dramatically stained as
>some examples I've seen on the net.
>
>John Stockdale
>
>
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