Re: Pyro for TP

Harald Leban (HLEBANPHOT@compuserve.com)
Fri, 16 Jan 1998 14:15:15 -0500

Nachricht geschrieben von Larry Bullis
>Then there's no point in spending the money for it. You can get it to
dissolve, though, and it's worth doing. Try 1) dissolving the bisulphite
first, then the phenidone and 2) dissolve the phenidone in boiling water
(yes, I mean it). You would then need to cool the phenidone/bisulphite
solution before adding the pyro, which would probably not survive the hot
water.

Acufine, a developer I used to swear simply didn't work, actually does.
However, if you follow the mixing directions, the phenidone does not go
into solution, and it performs poorly. If you mix it in boiling water,
it's great.

Phenidone is wonderful, but getting it to dissolve is always a problem. In
his _105[?] Formulas_ book Dignan had a section about it. I have it
somewhere.
<

OK,OK

Itīs worth to say something about the phenidone in the PPK developer.
This suspension is just only the stock , where itīs really not necessary
that phenidone is dissolved - you have to look at the concentration of it.
More I find that in suspension itīs more stable than dissolved (for the
storage). The trick with the boiling water is OK when you want to work with
this solution directly but a very strong way to make stock solutions of
developers(my opinion).

But back to the Pyro-Phenidone-Kodalk I think I told it unclear - When you
make the working solution and put the Part A(Phenidone-suspension) to the
water (5ml in 1000ml) the phenidone dissolves rapidly and should be a clear
solution when adding part B,(at22-25°C) - and so it works.

Greetings

Harry
hlebanphot@compuserve.com