[pure-silver] R: Re: suggestions
- From: "Antonio Banfi" <antoniomarioenrico.banfi@xxxxxxxxxxxxx>
- To: <pure-silver@xxxxxxxxxxxxx>
- Date: Sat, 12 Dec 2009 01:31:23 +0100
Thanks Richard and everyone answered my question :)
This is a really nice and informative list.
Best regards
Antonio
-------------------------------------------------------------
Antonio Banfi e-mail: antonio.banfi@xxxxxxxx
Dipartimento di Diritto Privato e Storia del Diritto
Sezione di Diritto Romano
Università degli Studi di Milano
Via Festa del Perdono 7 20121 MILANO
tel.: (+39) 02 50312610
fax: (+39) 02 50312507
mobile: (+39) 347 6871340
http://www.dpsd.unimi.it/
-------------------------------------------------------------
-----Messaggio originale-----
Da: pure-silver-bounce@xxxxxxxxxxxxx
[mailto:pure-silver-bounce@xxxxxxxxxxxxx] Per conto di Richard Knoppow
Inviato: venerdì 11 dicembre 2009 23.09
A: pure-silver@xxxxxxxxxxxxx
Oggetto: [pure-silver] Re: suggestions
----- Original Message -----
From: "Antonio Banfi"
<antoniomarioenrico.banfi@xxxxxxxxxxxxx>
To: <pure-silver@xxxxxxxxxxxxx>
Sent: Friday, December 11, 2009 8:41 AM
Subject: [pure-silver] suggestions
Hello,
I have absolutely no experience with Xtol, but I purchased
some of it to
develop rolls of tmax 3200 exposed @ 1600. I was mumbling
about the
following questions:
1) Whats the advantage in diluting xtol instead of
using the stock?
2) Given the stock time, there is a way to calculate
the "diluted
time"?
3) Any suggestion from your personal experience?
4) Last but not least, using a normal (non tmax) fixer,
I must increase
the fixing time?
Thanks to all & best regards
Antonio
Kodak has charts showing the effect of 1:1 dilution on
time.
For most developers the effect of diluting 1:1 is to
increase developing time about 1.4 times. This is not quite
consistent because there are effects from both the film and
developer. Also, there is an effect called induction time,
this is the time between applying the developer to the film
and the first appearance of the image. It will vary with
several factors but the practical effect is that there is no
absolute way of knowing the effect of dilution on a
particular combination of developer and film. Agitation also
makes a difference.
The main effect of diluting Xtol or D-76 1:1 is to
extend development time. For some films the full strength
developer is too fast for consistent results. When diluted
more than 1:1 other effects begin to take place such as loss
of maximum density due to local exhaustion.
For push processing these two developers should probably
be used full strength.
T-Max and Delta films have more silver iodide in them
than most other films so take longer to fix. Ammonium
thiosulfate fixer (rapid fixer) is less affected by the
iodide but complete fixation will take place with
conventional sodium thiosulfate fixers if the time is
extended. Most conventional films will fix out in about five
minutes in conventional fixer although the time is usually
extended to twice this. T-Max takes a full ten minutes to
fix out. I use a two bath system and fix for six or seven
minutes in each bath. Tests for residual silver show none.
The conventional test for fixing time is to fix a scrap
of the film and see how long it takes to "clear". That is
the time until the film appears to be clear other than for
the support tint on 35mm film, which is permanent. Fixing
should continue for about twice the clearing time. However,
its also useful to test for residual silver. The simplest
test is to use Kodak Rapid Selenium Toner diluted 1:9. Place
a drop of this on the well washed film and allow it to stand
for about two minutes, Then rinse off and look for any
staining. There should be no stain visible.
--
Richard Knoppow
Los Angeles, CA, USA
dickburk@xxxxxxxxxxxxx
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