I seem to recall George Scott developing photos as part of psychic
 investigations
in Peter Medak's THE CHANGELING.
 
Is there a darkroom shot showing the glowing radium in MADAME CURIE?
 
I'd also think of various films involving investigations--THE PARALLAX VIEW
or some more standard detective films.  Isn't there a scene like that in
CHINATOWN?
 
Don Larsson, Mankato State U (MN)
 
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