I must have been shown, at least once, how to
determine the emulsion side of film. I've not studied
various film sides except to determine which is the
'front'.  (digital converts need not read further):-]
Must be the side facing the lens.(?) The side that
receives the light..right? When I have noticed, I
believe it was the concave side.
Image reversal properties of lenses can, of course,
provide the answer if you're familiar with the scene.
Well, whichever, wouldn't that be the side to place
'front' down on a scanner? The image would then be
recorded after the light had passed through what must
be a greater thickness of film. 
I've had "pro" (expensive) labs (digital and optical)
print frames in reverse a few times, so it must
require more than a glance.
I'd appreciate your advice.

Thanks, Jack

 

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