DEAR DEAN,
And the Lippmann process is cited in almost every primer on Holography.
"Curiouser and curiouser!"
CHEERS!
BOB KISS
-----Original Message-----
From: dean kansky <dkansky@hotmail.com>
To: alt-photo-process-l@sask.usask.ca <alt-photo-process-l@sask.usask.ca>
Date: Tuesday, December 07, 1999 4:38 PM
Subject: Re: now here's a weird one...
>
>>I was just wondering if anybody had ever attempted the Lippmann process,
or
>>interference-phenomenon based coulour photography...
>
>French physicist Gabriel Lippmann (1845-1921) devised a system of color
>photography in 1981 that relied on wavelength
>interference rather than dyes or pigments. His panchromatic glass plate was
>coated with an almost clear emulsion made
>of very small silver halide crystals. In the camera, the plate faced away
>from the lens, and the emulsion was in contact
>with a nearly perfect mirror of liquid mercury. Light passed through the
>glass plate and emulsion and was reflected by
>the mercury. Phase difference caused the reflected rays to interfere with
>the light coming through the plate.. Varying
>degrees of cancellation and reinforcement ocurred, producing a latent image
>of the interference pattern set up within
>the emulsion. After development, the faint but natural color image was
>viewed by placing the plate against a mirror and
>shining a light through it. Examined at a carefully determined angle, only
>the original wavelengths could pass through
>the interference pattern. The process has proven to be too difficult for
any
>application beyond scientific investigation for
>which it was originally conceived.
>
> by H. Wallach in the Focal Encyclopedia of Photography
>
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