Rollei ATP film

On Mar 11, 1:48 pm, John wrote:
On Sun, 9 Mar 2008 22:42:40 -0700 (PDT), piterengel

wrote:
I don't remeber who told, but it seems POTA is "equivalent" of
Technidol. POTA is:

sodium sulphite anidrous 30 g
phenidone 1.5 g
water to make 1 liter

Actually that was Technidol LC. The liquid concentrate actually had
hydroquinone in it. Surprised the heck out of me.

JD
From Spur internet site, a german factory who produces Rollei ATP DC
SPUR developer, I've found the MSDS of this dedicated developer:

5-20 % Sodium sulfite
1-10 % Diethyleneglycol
0.1-1 % Potassium thiocyanate
0,1 -3 % Potassium hydroquinone sulphonate
0,1 - 2 % 1-Phenyl-3-pyrazolidinone
0.1-2 % Hydroxy-methyl-phenidone
0.1-2 % Sodium hydroxide

This is THE bath for Rollei ATP film. It would be interesting to
reproduce it: a typical question for Mr. Knoppow, of course...

Generally it is easy to find hydroquinone instead of its sulphonate
potassium salt (a question of solubility and pollution?), and
phenidone instead of the hydroxymethyl derivate (a question of less
pollution?). Making stechiometrics calculation I think it would not be
so hard to prepare it, even if for some components (diethyleneglycol)
I don't know the function of. pH of concentrated solution is 11.
Bye
Z.

On Tue, 11 Mar 2008 14:14:27 -0700 (PDT), piterengel
wrote:

From Spur internet site, a german factory who produces Rollei ATP DC
SPUR developer, I've found the MSDS of this dedicated developer:

5-20 % Sodium sulfite
1-10 % Diethyleneglycol
0.1-1 % Potassium thiocyanate
0,1 -3 % Potassium hydroquinone sulphonate
0,1 - 2 % 1-Phenyl-3-pyrazolidinone
0.1-2 % Hydroxy-methyl-phenidone
0.1-2 % Sodium hydroxide

This is THE bath for Rollei ATP film. It would be interesting to
reproduce it: a typical question for Mr. Knoppow, of course...

Generally it is easy to find hydroquinone instead of its sulphonate
potassium salt (a question of solubility and pollution?), and
phenidone instead of the hydroxymethyl derivate (a question of less
pollution?). Making stechiometrics calculation I think it would not be
so hard to prepare it, even if for some components (diethyleneglycol)
I don't know the function of. pH of concentrated solution is 11.
Bye
Z.

Thanks for the MSDS info. It's an interesting mix. Most of the
ingrediants are fairly standard except, as you've noted, the potassium
hydroquinone sufonate. I would imagine this would be more soluble than
the base hydroquinone. I wonder if this also gets less attention from
the EPA and other such entities. I'm somewhat surpised that they use
hydroxide and the pH of 11 is very high. Of course there is very
little if any buffering.

JD.

Another source of formulae for a Technidol-
style developers is the one that started the
craze back in the late 60's: H&W Control.
When used with Kodak High-Contrast Copy
the resulting (lack of) grain out did Tech-Pan.

See US Patents 3,772,019 & 4,083,722

--
Nicholas O. Lindan, Cleveland, Ohio
Darkroom Automation: F-Stop Timers, Enlarging Meters
http://www.darkroomautomation.com/index2.htm
n o lindan at ix dot netcom dot com