[filmscanners] RE: Topic: "Halo" Effect

["Austin Franklin" <darkroom@ix.netcom.com>]

> ..."anti halation" layer, which is a black coating
> on the back which has to be removed mechanically...

Arthur,

>From my experience, the anti-halation layer can be different colors, not
only black.  I'm not quite sure what you mean by "removed mechanically", but
for the films I use, no mechanical process is involved to remove the
anti-halation coating, if I understand what you mean by "mechanical".

If you pre-soak, on discharge, you'll see the wash water be dark blue/black
and mucky (or what ever color used), and this would be the anti-halation
layer and/or the sensitizing dye...depending on what is used on that film.
If you don't pre-soak it's removed in the developer.

When I first saw the water from the films with these dyes (I believe Neopan
1600 is the one that comes to mind?), it came as a bit of a surprise.

Austin

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