[pure-silver] Re: Weird Film Issue
- From: "BOB KISS" <bobkiss@xxxxxxxxxxxxx>
- To: <pure-silver@xxxxxxxxxxxxx>
- Date: Tue, 8 May 2012 08:06:38 -0400
DEAR RICHARD,
Please give us your take on this: I know that pin holes occur from
the interaction of a carbonate (e.g. sodium) with acid, like the acetic acid
stop bath, but I also thought that this we very temperature dependent. When
using a developer-stop bath process, I have always processed at 68-70 F and
have never experienced pin holes with the 8 different films I have used over
the years. I mostly use PMK with a water rinse and this is a non issue with
this dev but there are times I want the effect of other devs.
I recall a student who said that I was being compulsive to insist
that he process at 68-70 F using D-76 and stop bath. He said he didn't want
to spend the time and money keeping his darkroom cool and cooling the solns
before processing. He insisted that he could just adjust the dev times and
process at 80 F or higher. Well, his rolls of 120 negs looked like they had
been shot with birdshot...so many tiny clear holes, they were all ruined. A
rather expensive lesson he will never forget.
CHEERS!
BOB
-----Original Message-----
From: pure-silver-bounce@xxxxxxxxxxxxx
[mailto:pure-silver-bounce@xxxxxxxxxxxxx] On Behalf Of Tim Daneliuk
Sent: Monday, May 07, 2012 12:40 PM
To: pure-silver@xxxxxxxxxxxxx
Cc: Jean-David Beyer
Subject: [pure-silver] Re: Weird Film Issue
On 05/07/2012 10:58 AM, Jean-David Beyer wrote:
> Tim Daneliuk wrote:
<SNIp>
> So if you are going to get pin holing _after processing_, from where
> would the carbonate come? Would there be any left after the film was in
> the stop bath and the (usually) acid fixing bath?
>
> It seems to me that unless you are using an alkaline processing
> technique, you should be safe to put a little acid in a post hypo-clear
> rinse if you think it is necessary to clear hardness from the film.
>
Ah, sorry, I was referring to it only in the context as a stop bath.
I acknowledge that the pinholing risk even there is small these
days, I just don't feel like recalibrating my workflow. In a
running water stop, development continues briefly, whereas it
pretty much stops immediately in contact with an acid stop bath.
--
-----------------------------------------------------------------------
Tim Daneliuk
============================================================================
=================================
To unsubscribe from this list, go to www.freelists.org and logon to your
account (the same e-mail address and password you set-up when you
subscribed,) and unsubscribe from there.
__________ Information from ESET NOD32 Antivirus, version of virus signature
database 7120 (20120508) __________
The message was checked by ESET NOD32 Antivirus.
http://www.eset.com
=============================================================================================================
To unsubscribe from this list, go to www.freelists.org and logon to your
account (the same e-mail address and password you set-up when you subscribed,)
and unsubscribe from there.
Other related posts:
