Re: Spectral density negatives, again

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CCBaggett@aol.com
Date: 04/11/02-05:11:28 PM Z


In a message dated 4/11/02 12:38:50 AM Eastern Daylight Time,
kthayer@pacifier.com writes:

>
> Sandy King wrote:
> I would
> > suggest that there is a much higher probability of some other
> > explanation for David's result. Perhaps his gum got fogged from the
> > long exposure - heat from the exposing light for an hour
>
> If he got the result only from the 1- hour exposure, of course simple
> overexposure would be the most likely explanation for it, and if he was
> using a hot light without a cooling fan, his emulsion would surely be
> cooked. But what he said was that he made a series of test exposures,
> from 1 minute to 1 hour, and got the same result at all exposures, which
> makes it quite unlikely that his result was primarily related to the
> length of exposure.
> kt
>

Sandy and Katherine,
       It could be something silly. After I received PFJ #1 I decided to try
gum. I have been printing pt/pd since the mid-70's. For my first print I used
some gouache I purchased at the art store. I got a blank page- no picture. I
sent an email to Judy and after a couple of exchanges it was decided to start
over and follow the directions in PFJ#1. (I resort to directions when
everything else fails.) This time I used W+N watercolor paint and voila- a
picture. I wouldn't elevate it to the status of print. Several weeks later,
still curious at the total failure, I looked at the tube. It was acrylic- not
water soluble. Doh! More recently I decided to try a casein print. I bought
some Shiva casein paint and casein medium. I realized that the medium might
not work. It didn't. However, when I took the exposed paper out of the frame
and looked at it there was a faint image like gum. I guess it was the
dichromate which washed off the insoluble medium. Since I have tried Lukas
Werth's approach in PFJ#6 and made a casein print. I haven't recovered from
the ammonia in my 7'x7' darkroom. I'm kidding, but it was pretty unpleasant.
This weekend I am going to try caseinate made with Borax instead.
       One other point. My negatives are developed in Pyrocat-HD for pt/ag
printing. My previous negatives were developed in Rollo Pyro for pt/pd. I
have used both as well as my older negatives (developed in D-23 or HC 110 for
pt/pd) for Ware's cyanotype, argyrotype and gum. They obviously are not
optimized for all processes, but they print and are are workable.
Cheers,
Charlie Baggett


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