[filmscanners] Re: Topic: "Halo" Effect

["Arthur Entlich" <artistic-1@shaw.ca>]

Hi Laurie,

Yes, you've got the scenario correct, I think I mentioned it was usually
respools from cine films.  And yes, it made a real mess for us when we
had to deal with it with our C-41 systems, althought we usually were
back up and running in a day (after a long late night! of replacing
chemistry, and washing down every darn tank, gear, belt, etc....)

Of course, we also flogged the staff member who let it get through our
screening process to begin with, and we sent out people to break the
kneecaps of the client who brought it in ;-)

Art

Laurie Solomon wrote:

> 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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