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Author
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Topic: Red (not cyan) soundtracks
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Peter Hall
Master Film Handler
Posts: 314
From: London, UK
Registered: Dec 2000
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posted 07-01-2002 12:45 PM
Does anyone have experience with red soundtracks ? We've seen a few, mailny from Eastern Europe - looks like a standard SVA track but it's RED ! On playback (through a Kinoton FP20 with a standard tungsten exciter lamp and a normal stereo cell) sound is noisy and low level. Surely if the site had a red LED or laser reader, red light through a red track would make the track indefinable ? Assuming that the ideal wavelength of light source for playing a red track is half way between that of yellow and magenta (I guess around 490nm) this would give the worst possible reproduction ..Does anyone know if red tracks are in widespread use anywhere, and if so what results these territories get with LED or Laser readers ? PS - shamless plug - if any cyan conversion kit can do this, our laser can ! Replaces the slit lens, can fit almost any projector, priced less than a good night out (in London, anyway !).
www.fproj.com/cyan Cheers Peter
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John Pytlak
Film God
Posts: 9987
From: Rochester, NY 14650-1922
Registered: Jan 2000
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posted 07-01-2002 01:07 PM
I'll second Steve's hypothesis that any recent "red" track is probably high magenta where the lab accidently did not redevelop the silver. Today, analog tracks are either the traditional cyan+magenta+silver, or the "high magenta" magenta+silver. There is no current practice of a magenta dye only track, much less a magenta+yellow (red) dye track.------------------
John P. Pytlak, Senior Technical Specialist
Worldwide Technical Services, Entertainment Imaging
Research Labs, Building 69, Room 7525A
Rochester, New York, 14650-1922 USA
Tel: +1 585 477 5325 Cell: +1 585 781 4036 Fax: +1 585 722 7243
e-mail: john.pytlak@kodak.com
Web site: http://www.kodak.com/go/motion
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Leo Enticknap
Film God
Posts: 7474
From: Loma Linda, CA
Registered: Jul 2000
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posted 07-01-2002 03:08 PM
Hi Peter:A misdeveloped hi-magenta track seems to me very likely if this is a recent film. If these are older prints, one other possibility springs to mind. There was recently a thread on the AMIA Internet list about discoloured optical tracks (both VA and VD) with the offending tracks being described as 'yellow', 'orange' and variants thereof. José Llufrío of the Cuban Film Institute offered the following explanation: quote:
A sulphide track was used before efficient re-developers of Hidroquinone came into use. This was usual until well into the late 60's early 70's, as far as I remember from AGFA technical brochures I read around 1972.Sodium sulphide was mixed with a thickening agent, so it could be applied upon the sound track and not spread to the rest of the film. It acted very fast, providing a yellowish sound track, which would not change much in time (at least not within the time a print was supposed to last for release), and would be opaque enough for the photocell in the projector.
Given that Agfa, together with Orwo, virutally had the Eastern Bloc market in release print stock sewn up between them in those days, I guess this might be a possible explanation for the tracks you're coming across. But apparently this method of development is no longer in regular use, so if these are new(ish) prints, that wouldn't explain it.
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