[pure-silver] Re: not finding info for Kodak Technical Pan
- From: "Richard Knoppow" <dickburk@xxxxxxxxxxxxx>
- To: <pure-silver@xxxxxxxxxxxxx>
- Date: Thu, 16 Apr 2009 00:26:16 -0700
----- Original Message -----
From: "Janet Cull" <jcull@xxxxxxxxxxxxx>
To: <pure-silver@xxxxxxxxxxxxx>
Sent: Wednesday, April 15, 2009 8:20 PM
Subject: [pure-silver] Re: not finding info for Kodak
Technical Pan
Thank you, both. This is a roll of film my son-in-law
asked me to process for him. It's old film, and not one
I'm familiar with anyway. I'm thinking about having him
just send it off.
Joel, thank you so much for the beautiful print! I always
enjoy seeing your work.
Janet
Kodak Technidol Liquid was the recommended developer.
It is essentially a POTA type, that is, Phenidone and sodium
sulfite. In that respect it is similar to D-23 but made with
Phenidone instead of Metol. Phenidone, on its own at
relatively low pH is a very low contrast developer. POTA was
formulated for special purposes such as nuclear blast
phtography. Because Technical Pan was essentially a high
contrast copy film it needed a special developer for
pictorial purposes. Diluted standard developers simply do
not work well.
Technidol, while essentially POTA also had other
ingredients such as a wetting agent, the latter because
there were always problems with non-uniform development.
Anchell may have a formula similar to Technidol, otherwise,
in the absense of the real thing I would suggest POTA the
formula for which is on the web.
Note that Kodak recommended a special agitation method
for technical pan to insure uniformity. The use of an
invertible type tank is necessary. Instead of inverting the
tank is shaken vertically rather rapidly.
I still have Tech Pan data sheets and can forward one
to you if you desire.
--
Richard Knoppow
Los Angeles, CA, USA
dickburk@xxxxxxxxxxxxx
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