Wavelength response of first type of film with sound? - rec.photo.darkroom

Message from discussion Wavelength response of first type of film with sound?
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From: Pat <gro...@artisticphotography.us>
Newsgroups: rec.photo.darkroom,rec.arts.movies.tech,rec.arts.movies.production,alt.photography,aus.photo
Subject: Re: Wavelength response of first type of film with sound?
Date: Tue, 12 May 2009 09:06:35 -0700 (PDT)
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On May 12, 11:29=A0am, GreenXenon <glucege...@gmail.com> wrote:
> Hi:
>
> What wavelengths of light specifically affect the type of film used in
> the first movie containing an variable-density optical audio track? I
> am specifically interested in the chemical composition of the optical
> audio track.
>
> From what I know, most of the more modern films are unaffected by red
> light.
>
> I'm thinking of a theoretical device using analog audio recording on
> VD optical tracks containing the oldest film chemical composition. The
> source of light are multiple laser beams consisting of wavelengths
> that could record the audio onto the film. Each beam has a different
> wavelength. The beams are then mixed together to get a single beam of
> all the necessary wavelengths. The beam then shines onto the film to
> record the audio.
>
> I don't have much of an application here. I'm just in it for the
> science.
>
> Thanks

I have not idea, but Kodak has a museum in Rochester (NY).  Call them,
they might be able to help.