[Leica] Xtol dev times

[martin at jangowski.de (Martin Jangowski)]

On Tue, 29 Nov 2005, Mark Rabiner wrote:

> NO PHENIDONE either.
> It's DIMEZONE instead.
> Dimezone is a Kodak trade mark version for a Phenidone derivative which is
> more stable they say than Phenidone. I think it may be as different from
> Phenidone as sugar is to NutraSweet.


Phenidone, Dimezone and Dimezone-S are chemically close related. The main 
difference for the user is that Phenidone is less stable and not as easily 
going into solution in water. OTOH, it is a little more active, as a rule 
of thumb you can replace Phenidone with about 20% more Dimezone-S.

Xtol contains Dimezone-S, the typical copper colored solution after giving 
Part I to the water comes from Dimezone-S. It will get colorless after 
adding ascorbic acid and sodium sulfite. I routinely use DS-10 from 
R.Suzuki (http://silvergrain.org/Photo-Tech/film-dev-recommend.html) as my 
main developer for films like the Deltas, Acros and 400TX. Extremely fine 
grain and good sharpness.

Gr??e aus Hohenlohe,

        Martin Jangowski

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