From: Tillman Crane (tillman@tillmancrane.com)
Date: 11/30/01-07:35:41 AM Z
Hi All,
A couple of thoughts..
I found that when printing pyro negs on VC paper with a VC cold light
head the printing times were extremely long, but on graded paper no
where near as bad. Also with a condenser head the pyro times were not
as long as with the vc cold light head. A traditional cold light
head was also better then the VC cold light head.
So I found using VC paper with a vc head on pyro negs tough to print,
better with a traditional cold light head and best with tungsten
light. Graded papers it didn't seem to make as much difference with
either tungsten or traditional coldlight.
I had very long printing times with pyro negs so my problem may have
been both over exposure and over staining.
I am going to try Sandy's pyrocat formula soon.
Now for my really dumb question..
On a Macbeth 504 color densitometer which channel is reading when the
blue dot is pointing DOWN, blue channel or red channel? I have always
used it with the blue dot down and thought I was reading through the
blue channel.
Please advise.
thanks.
tillman crane
>Judy Seigel wrote:
>
>>
>>I don't know the Weese & Sullivan method, but I would assume you could
>>adapt the Post-Factory (Issue #1) white-card method to pyro. Expose, &
>>develop a 21-step in pyro, print in your chosen medium, then read your
>>pyro-developed negative against that. (Sandy: Yes? No?)
>
>Yes, that would be the best way to actually determine the ES of your
>printing medium with the type of negative being used. Even better
>than a densitometer.
>
>> But I note that in
>>the article Sandy says you can read the pyro neg in the blue channel of a
>>color densitometer, or with filter on b&w densitometer...
>
>Reading a negative of step wedge developed in a staining developer
>gives you a much better approximation to the printing contrast of
>that negative than by reading the negative through a B&W
>densitometer, or through the full color spectrum of a color
>densitometer. However, even the blue channel does not fully reveal
>the printing contrast of the negative with alternative process as it
>is actually somewhat higher than the blue channel indicates.
>
>On the other hand, for printing with VC papers the actual printing
>contrast of density of a stained negative is somewhat less than the
>blue channel indicates. This fact explains why Carl Weese gets
>double duty from his negatives that serve for printing in silver but
>also in Pt/Pd. Or at least that is how I understand the question.
>
>Sandy King
>
>>
>>Judy
>>
>>.................................................................
>>| Judy Seigel, Editor >
>>| World Journal of Post-Factory Photography > "HOW-TO and WHY"
>>| info@post-factory.org >
>>| <http://rmp.opusis.com/postfactory/postfactory.html>
>>.................................................................
>
>
>--
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