[pure-silver] Re: Technical Pan
- From: titrisol <titrisol@xxxxxxxxx>
- To: pure-silver@xxxxxxxxxxxxx
- Date: Tue, 4 Nov 2008 07:54:37 -0800 (PST)
On a side note, the MACO/Rollei peopl ehave that TP replacement film and a
low-contrast developer for it. maybe worth trying
--- On Tue, 11/4/08, Richard Knoppow <dickburk@xxxxxxxxxxxxx> wrote:
From: Richard Knoppow <dickburk@xxxxxxxxxxxxx>
Subject: [pure-silver] Re: Technical Pan
To: pure-silver@xxxxxxxxxxxxx
Date: Tuesday, November 4, 2008, 4:31 PM
----- Original Message ----- From: İbrahim Pamuk
To: pure-silver@xxxxxxxxxxxxx
Sent: Tuesday, November 04, 2008 1:47 AM
Subject: [pure-silver] Technical Pan
Hi,
I have unopen but expired 10 years old bulk Technical Pan. I know that
Technidol might be the best for pictoral use. I have also used with 1:150
Rodinal.Is there any other recommendation?
Best Regards
Ibrahim Pamuk
Technical Pan required a special developer called Technidol. I doubt if
its still available but similar results can be gotten with POTA. Pota is a
special, very low contrast developer, made with essentially Phenidone and
sulfite. While highly diluted Rodinal will work it really is not optimum. One
formula for POTA is:
Water at 125 F------------300 mL
Sodium Sulfite-------------30 g
Phenidone-----------------1.5 g
Water to make --------------1 Liter Use cold distilled water
This developer must be mixed shortly before using and is to be discarded after
use.
While distilled water is called for I don't think its necessary.
Photographer's Formulary has a somewhat different formula at:
http://www.photoformulary.com/uploads/01-0075.pdf
Note that both of these as well as Kodak Technidol Liquid are short lived
in working solution.
I don't know if the data sheet for Technical Pan is still available
from the Kodak web site,
if not I have it and will send it via e-mail if you like.
Its possible that Freestyle may still have some Technidol Liquid in stock.
Note that a special agitation technique is required by the directions. I
don't know if this is a specific requirement of Technidol Liquid or is due
to the very thin emulsion of Technical Pan. Technidol appears to have
surfactants to avoid uneven development. This was a problem with early Technical
Pan as well as emulson faults (small spots), the cocktail shaker agitation may
be a result of this.
When I used Tech Pan I found that the recommended development times give
somewhat higher contrast than I wanted so reduced time about 20% and added about
3/4 stop of exposure.
Note also that Tech Pan has extended red sensitivity, this may result in
somewhat strange tone rendition of skin tones (too light), a light green filter
will cure this. For women the effect can be flattering but there is a loss of
modeling unless some care is taken with the lighting.
--
Richard Knoppow
Los Angeles, CA, USA
dickburk@xxxxxxxxxxxxx
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