[Leica] Film mystery

[daniel.ridings at muspro.uio.no (Daniel Ridings)]

I seem to remember that BD reported his lab ran into this a little over a
year ago (he's been shooting digital since then :) ). I don't remember if
they ever figured out what the cause was but I do remember BD telling us
about it.

Jocular:
http://leica-users.org/v23/msg09047.html

Daniel


On Tue, 20 Jul 2004, Benjamin Marks wrote:

> Dear LUGgers:
>
> This evening I processed a roll of (new formulation) Tri-X in XTol 1:1.  
> The Xtol was fresh, mixed up in distilled water, but diluted with tap 
> water; I generally get very good results from this combination.  The film 
> was bulk loaded and exposed in an M6 with a 50 Summicron. Film was 
> pre-soaked and processed in a Jobo processor wth seven other rolls of 
> film.   The images seem ok - density is what I expected. BUT on the 
> non-emulsion side of the film there is a green patina.  Re-fixing does not 
> get rid of it.  One other roll of bulk Tri-X from the same batch shows 
> some of the same patina on the sproket-holes of one edge of the film only. 
>  None of the other film was so affected (Delta 400).  Now in addition to 
> the patina (which in several spot looks like small circular blooms 
> resembling mold growth), there is a"negative" images in the patina, 
> including one rectangular one that has clearly defined edges which sits in 
> the middle of the strip astride two images (like a "clear" rectangle, less 
> than the width of the film) .  If the patina were not on the non-emulsion 
> side of the film, I would say that it looks like the film was fogged.  But 
> what would produce this sort of fog?  Film was shot at home, never put 
> through an airport x-ray machine (by me at least) and has sat undeveloped 
> in my bag since late May (I'm just catching up on some developing . . .)
>
> Any ideas?
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