The Saint Paul globe. (St. Paul, Minn.) 1896-1905, 1897-03-15

-ChaSsagne, of blue, green and red
and the print takes up the appropriate
colors in appropriate parts the three
colors giving by their various combi-
nations all varieties of hue.
Sir II. Trueman Wood, in comment
ing upon this phenomenon says:
How it is that this power of select
i've absorption is given to the compo-
nents of the Photographic image-prin-
clpally, of course, metallic SilVer-is il
appears to me, the interesting question
connected with the process. The ac-
ton is certainly previously unknown,
and it will as certainly repay scientific
investigation
The English investigators declined TO
be convinced by the mere inspection
OF the finished result, and the inventor
demonstrated ali the details of the pro-
cess to them. They took a number of
photographs themselves on the day be-
fore the experiment
SIMPLE COLORING.
The light. they say. upon that occa-
sion was extremely bad, the sky beins.
overcast, and unfavorable atmospheric
conditions prevailed. Notwithstanding
this, however, the positives. which were
made within tWenty-four hours after
the negative, showed with perfect dis
Effectiveness, when treated according To
the Villedieu-Chassagn process. the
colorS of a bunch of flowers which the
secretary of the Society of Arts had
bought at Covent Garden The combi-
nation Of colors in such a subject can
be readily understood. Photographs of
subjects not possessing such brilliant
tlnts were equally successful.
The experiments of the Englishmen
We're confined to gelatine films, but the
inventor treated with complete success
some paper positives he had brought
from Paris These are described as
looking like ordinary silver prints
toned with gold
Capt. Darcy, in describing the
quality Of the solutions, declares that
the coloring is of very simple nature
Ihere are three dyes" he writes-"a
crimson red, grass green and a very
good blue, all in solution and probably
mixed with some other ingredient be-
sides water. There is what we NAV
call mordant, in the shape of a color
less liquid, containing, l should say.
aIbumen and salt
The last liquid is brushed copiously
over the face of the positive on the
silver print and the blue dive apnIied
a little al a time. 1t was declared that
the coloring must take place in good
daylight. The blue dye RAPIDLY takes
| mold of these portions of the surface
which are represented in monochrome
blues in the original
For instance, china vase will take
the blue tint, and the face or hands
faint amount of the same color. The
green dye is applied in the same man.
ner, and the greens in the original
make their appearance in the positive.
as do the red tints Finally, the print
or positive presents a picture in colors.
underlying which is the dark brown
silver image. It appears that the i'm
age takes up SelectiVelv these tbrao
colors, but why it takes them ND II is
hard to see I have a portrait done
by him in the manner described, and
the negativc has evidently been re-
touched with a pencil. 1t is hard to
understand why a pencil mark could
be the cause of selective absorption of
the colors. That the success of the
process does not depend upon the in
ventor's intervention is quite evident.
Were it in the negative which took up
the color one might understand the
matter better