P3D Autochromes

[Bob_Maxey@xxxxxxxxxxxx]

>>RE: Someone said pan film not available to about 1929...maybe in
>>quantity or retail, BUT panchromatic dyes discovered about 1910 by
>>Fischer et al..an Lumiere Color with pan film and filter mosiac of
>>dyed potato starch grains is from 1913 or so and reached movies
>>and early National Geographic repros.


This process was called Autochrome. Not very good, especially in stereo.
Currently I have a few examples of stereo Autochromes, but they are larger
than a standard stereo slide. Sure wish I could see them in stereo with a
better viewer.

FYI: The plates were made by mixing dyed starch grains that have been
sorted for uniformity, and applied to a glass plate. Rollers were used to
insure good contact. A dusting of black material - coal dust as I recall,
was applied to fill in the gaps between the grains.

RM



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