small spots

["Stan Patz" <skp113@xxxxxxxxxxx>]

>Recently, there have been some comments on small spots on some IR
>film that was developed.  The reason for this is that it is kept >frozen 
>and it must be brought up to room temperature before it is >loaded in the 
>camera.
>The spots are caused by condensation that make those areas of the >film 
>develop faster that have had a spot of condensation.
>The problem may be the calcium in the water.

To Charles and the group,

I don't recall recent comments on small spots. It is also very difficult to 
diagnose film problems without visual aids, but it sounds like the "pinhole 
problem" which prompted my long dialog with Kodak personnel.

Kodak has admitted a manufacturing problem with 4x5 HSI - and to a lesser 
extent on 35mm HIE- where particles from an anti-static layer migrate into 
the image forming emulsion. The results are very fine, irregular "pinholes" 
visible in dark parts of the negative.

Larger round spots are usually caused by air bubbles clinging to the film 
during development. I never heard of calcium or condensation spots causing 
"hypersensitivity". Anyhow, more sensitivity would produce dark spots on the 
negs, the opposite of the voids caused by air bubbles.

Stan Patz   NYC
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