[filmscanners] RE: Topic: "Halo" Effect

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

Hi Arthur,

> ...Unfortunately, occasionally this film would still sneak
> in. It had an anti-halation coating which was not soluble in photo
> chemicals, but did, none the less, come off at color chemical processing
> temperatures, making an absolute mess of the chemistry,

Probably an important point for anyone re-using chemicals to make sure this
stuff is off before going through chemicals that get re-used.

> Back then, apparently, the proper process for this film was that it was
> wet down and then the anti-halation layer was buffed off the film
> mechanically,

I'd never heard of that.  Very interesting.

> Certainly possible newer films use a fully soluble coating which comes
> off in the chemistry with little or no side effects to the other films
> and equipment.

At least so far, that's the case with the films I've processed in my Jobo.
I only noticed the dyes because when I first set-up this unit, I didn't have
a drain set-up, so I had to use a bucket for discharge.  It was, needless to
day, a bit "interesting" to see this black muck coming out of my new film
processor!

Regards,

Austin

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