On Tue, 11 Mar 2008 14:14:27 -0700 (PDT), piterengel
<pslaviero@[EMAIL PROTECTED]
> 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.
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