Re: Colored Dags?
> But there IS such a process, is there not....
> Please explain!
> Which process are you referring to, who debunked it and when?
The Hill "Heliochrome" process (c. 1850), (also sometimes known as
"Hillochrome") which was the subject of the Reverend Levi Hill's
"Treatise on Heliochromy," was debunked by Marcus Root in 1851. If I
recall correctly, this is all discussed in Phil Davis's "Photography,"
7th ed., Brown & Benchmark, Madison, Wisconsin 1995. I saw something
written by Root at one time, but those neurons won't fire anymore!
Some researchers in the later 20th century did, in fact, succeed in
making "color-ish" Daguerrotypes. There was a thread about color dags
on the list about 3 years ago. Here's what I posted then:
"I think the sensitive plate was prepared using very close to standard
Dag practice, but development was not chemical, perhaps Becquerel, and
there was something very fragile or fugitive about the image --
perhaps, as has been said by others on this thread, that fixing
destroyed the colors.
In any event, the color mechanism was found to be interference -- the
light waves recording the image produced chroic (probably dichroic, but
I do not recall) interference filters by creating some sort of layered
structure of the image deposit. [This suggests that pure, monochromatic
colors, such as the color spectrum from a prism, would give much better
results than the impure, polychromatic reflected colors of real-world
Wish I 'membered more, but alas that's all I retain today."
A fellow named Boudreau recently claimed to have made Hill's process
work, but I do not believe that Hill's Treatise gave sufficient details
to practice the process, so whatever Boudreau did, it may well not have
been what Hill claimed to have done. Boudreau published an account,
which I have not seen:
Boudreau, J., Color Daguerreotypes: Hillotypes Recreated. Pioneers of
Photography: Their Achievements in Science and Technology. Springfield,
VA: The Society of Imaging Science and Technology, 1997, distributed by
the Northeastern University Press.