I believe they were shot through red, green and blue filters, then printed with three separate red, green and blue light sources. However, that doesn't account for the paper chemistry.
Paul
On Sep 3, 2009, at 9:04 PM, Scott Loveless wrote:

On 9/3/09, Graydon <[email protected]> wrote:
On Thu, Sep 03, 2009 at 08:54:58PM -0400, Desjardins, Steve scripsit:

I didn't realize they could do color that well back then.


Arguably, they couldn't; it was a three-sequential-negatives process,
and really tough to put back together chemically to get a colour image.

If I'm following the various articles correctly, many of the images now available were not available at the time; digital recombination is much
easier and the Library of Congress had all the possible ones done.

I thought it was 3 monochrome positives projected through 3 separate
filters.  Red, green and blue, or something like that.  And that
getting the projectors set up properly was the hard part.  Or maybe
I'm smoking crack again.

--
Scott Loveless
Cigarette-free since December 14th, 2008
http://www.twosixteen.com/fivetoedsloth/

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