Re: Odd marks on negative -- help needed

[Don Roberts <droberts@xxxxxxxxxxxxx>]

Some of these appear to be  water marks.  Do you use PhotoFlo or any
other drying agent?  Others are similar to marks I have had showing up
from time to time on my 70 mm IR.  I have never been able to track down
the source for these either. Your comment about manufacturing flaws
makes me wonder.  The film I am using is about two years old and is
frozen until I need it.

Steve Homer wrote:

> In need the list's advice about some odd marks on my
> negatives. Occasionally with past rolls of Kodak IR
> Aerographic (70mm), and on almost every frame of the
> latest roll I bought, I am getting stains or marks on
> the negative. These appear as lighter wavy lines
> wandering across the print or contact sheet, about 1mm
> wide. You can see a sample contact sheet at this URL:
>
>         http://members.cruzio.com/~shomer/stain.jpg
>
> I had processed this film for three years with no
> trouble. I use TMAX-RS developer as a 1-shot developer
> (no reuse or replenishment); Kodak indicator stop;
> Lauder non-hardening fixer; and Heico hypo-clear; with
> a final rinse in Kodak photo-flo. Mixing all the
> chemicals fresh makes no difference in the
> stains/marks, and TMAX 100 or Maco IR processed in the
> same stop, fix, and hypo clear do  not show these marks.
>
> The only changes in my processing recently are:
> switching from Ilford fixer to Lauder, and from Orbit
> Bath to the Heico hypo-clear. I didn't notice that the
> problem started when I switched to either of these
> chemicals, but that is possible.
>
> Does this seem like a manufacturing problem in the film
> or a processing problem? Is it plausible that the
> change of fixer or hypo-clear is to blame? If it's a
> processing problem, can anyone offer a suggestion for
> avoiding it? Any advice would be appreciated.
> ____________________________________________________
> Steve Homer    shomer@xxxxxxxxxx   Santa Cruz, CA  USA
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--
============================================================
   Don Roberts * Bittersweet Productions * Iowa City, IA
         *                         *
  And the Devil whispered behind the leaves, "It's pretty,
  but is it Art?".   --  Rudyard Kipling
============================================================


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