[filmscanners] RE: Topic: "Halo" Effect

["Laurie Solomon" <laurie@advancenet.net>]

If I am not mistaken, wasn't the film with the black anti-halation coating
movie film, which a few mail order places like Seattle Film Works use to
sell respool film taken from the unexposed tail ends of the large movie film
reels.  This film use to require a special processing which invilved
removing the anti-halation coating prior to processing.  If one took it to a
regular color film processor for C-42 processing, it would come off and gum
up the automated processors something terrible causing them to need to be
shut down for a few days until the stuff could be cleaned out, which is why
regular labs mad a point of trying to avoid this film and it could only be
sent to movie film processors or the places that sold the tail ends as
respooled 35mm color film.

I understand that this is no longer the case with those films which now do
have fully soluable coatings that will come off with chemistry ( I am just
not sure if it will dissolve with regular processing chemisty or needs
special chemistry.

-----Original Message-----
From: filmscanners_owner@halftone.co.uk
[mailto:filmscanners_owner@halftone.co.uk]On Behalf Of Austin Franklin
Sent: Wednesday, August 21, 2002 7:56 AM
To: laurie@advancenet.net
Subject: [filmscanners] RE: Topic: "Halo" Effect


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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