On Mar 11, 1:48 pm, John <use_...@[EMAIL PROTECTED]
> wrote:
> On Sun, 9 Mar 2008 22:42:40 -0700 (PDT), piterengel
>
> <pslavi...@[EMAIL PROTECTED]
> 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.
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