[pure-silver] Re: High B+F with DS-10
- From: "Gene Johnson" <genej2@xxxxxxx>
- To: <pure-silver@xxxxxxxxxxxxx>
- Date: Wed, 2 Feb 2005 19:34:34 -0800
I wonder if a little Potassium Bromide would do the trick like it did for
the Gainer's P-C-Prestone stock.
----- Original Message -----
From: "Craig Schroeder" <craig@xxxxxxxxxxxxxxxxxx>
To: <pure-silver@xxxxxxxxxxxxx>
Sent: Wednesday, February 02, 2005 7:30 PM
Subject: [pure-silver] Re: High B+F with DS-10
>
> I've been getting slightly high BF+ with faster films and DS-10 (using
> Dimezone-S). My last few rolls of HP5+ and Delta 400 have run from .33 to
> .40. I'm not having this issue with PanF and FP4 and wonder what, if
> anything could moderate this with the faster emulsions? Normally I
wouldn't
> worry about it but some darkroom equipment I'm adapting to is easier to
> control with less general fog/staining.
>
> Ryuji Suzuki wrote: From: Ryuji Suzuki <rs@xxxxxxxxxxxxxxx>[1] Subject:
> [pure-silver] Re: High B+F with DS-10 Date: Tue, 04 Jan 2005
10:54:46 -0500
> (EST) From: Stane Ko=E8ar <stane.kocar@xxxxxxxx>[2] Subject: [pure-silver]
> High B+F with DS-10 Date: Tue, 4 Jan 2005 11:02:08 +0100 A few days ago I
> made Ryuji's DS-10 developer. Since I dont have Dime= zone S, >I added
> properamount of Phenidone direct to the working solution (as= Ryuji
> >suggested). I developed a few films and noticed, that B+F of the deve=
> loped>films (Ilford Pan 400) is pretty high (higher than in any developer
I=
> used >so far in thirty years (Rodinal, HC-110, Microphen, A-49, DS-1,
DS-2.=
> ..). I >don't have densitometer, so all as I can tell is that contacts
> needed= 1/2 a >stop more light to produce black on the film edges. >Is
this
> normal? Not really. DS-10 has rather high fog, but the fog is about
> comparable to D-76 or XTOL with films I tried. I have some test films that
> were developed with Phenidone in DS-10, so let me check if they have any
> higher fog than Dimezone S. Forgot to come back to this thread. Phenidone
> produced higher fog than Dimezone S. I checked the literature again, this
> wasalso noted by Axford and Kendall in 1956. Phenidone is more active than
> several substituted versions. Dimezone S is almost as active as the
original
> Phenidone but with lower level of fog. I think supply of Dimezone S is
> improving and I hear yet another company is trying to get some in stock. I
> think this is a good thing. -- Ryuji Suzuki "Keep a good head and always
> carry a light camera."
>
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