The Saint Paul globe. (St. Paul, Minn.) 1896-1905, 1897-03-15
COlOrs at Last.
The Great Problem in Photography Has Been
Practically Solved

According to information which has
come to this country, and which is
now under discussion by the American
Association Of Amateur Photographers,
the problem of 1chromatic photogra ply,
which has been so long experimental
with, and which has been declared
solved so many times, only to discover
that the announcement was prema-
ture, has been at last solved by Mr.
Villedieu-C hassagne, of Paris.
The French eXperimenter has been at
work on various solutions for a long
time 1t will be remembered that prev
iOus efforts to secure chromatic photo
graphy have been made with prepara-
items in powder form and on the mega
tive NJ. Villedieu- Chassagne over
throws both of these principles and uses
solutions instead of powders and oper-
ates upon the positive instead of the
negative.
Within the last fortnight experiments
have been made in London by Sir H.
Trueman Wood, the secretary Of the
Society of Arts, and Capt. w. Darcy,
with view to testing Villedieu-C has-
Sagne's process.
While both of the English expert
mentors started in upon their inquir-
les with decided scepticism, they were
converted, if not entirely, still to a
very notable degree to the French in
ve.ntor's theories The Villedieu-Chas-
sagne process was originally suggested
by Dr. Adrian Bansac but the recent
development of it has gone very far
toward destroying all of the details of
the Bansac process, leaving only his
theory behind.
The demonstration according to the
advices received by the amateur as
ISOLATION in this city took place in a
! IoID Of
The gentlemen who were present were
| Professors Thomson and Herbert Jack
son, of Kings college; Sir H. True
man Wood and Capt Darcy Ac-
| cording to the description of the ex-
periments which is given by the secre-
tary Of the Society Of Arts, the coIors
/ of the natural object are produced
photograph. Sir H Trueman Wood
says:
PRACTICALLY SOLVED
ITO say that gilledieu- Chassagne's
| process enables photographs to be pro-
! duced in natural colors would not per-
haps be strictly true, since coloring
media are introduced, but the result of
the process is la photograph in the col
ors of nature a faithful reproduction in
color Of the object photogra phed, and
so for all practical purposes 1t may
be said that the long sought object cf
photographing in colors has actually
been obtained.
Villedieu- Chassagne insists at pres
ent on keeping secret the nature OF
the four solutions he employs, but this
secrecy will be broken, he promises.
upon the perfection of the recording
of the invention in the various coun-
tries of Europe. "A negative is taken
on a gelatine plate prepared by treat
ment with one of his solutions This is
developed and fixed in the ordinary
manner. 1t shows no trace Of color.
From it a print is taken on glass or
paper, the plate or paper being es-
pecially prepared by treatment with
the same solution.
The transparency Of the paper print
in no way differs in outward appear
ance from the ordinary positive. and
shows no trace of color by transmitted
or by reflected light. The print is then
washed over successfully with the three
colored solutions prepared by Vile