New-York tribune. [volume] (New York [N.Y.]) 1866-1924, 1892-05-18
punTnG OF COLORS.

A little more than year ago we reported ID
some detail the experiments In Photography OIL
! oio-s that had been made by Mr. Lppmann, in
Paris and their results. The process employed by
him il will he remembered, consisted in placing
n rejecting surface behind the sensitized plate, so
that the rays of light. after penetrating the film.
| would be turned back through it again. mus MI.
| Iippmann succeeded in producing several mega
tives in which the coors Of stained glass WINDOW
wen, pretty faithfully introduced. The chleI uil-
Gcultv with which he had TO contend was INC
character Of the sensitive flm which was 100
coarse in quality and too slow in action. His op-
erations since that time have been largely dl-
rccted toward an improvement OF the film. ana
the success attained by him is now made known
IN the last number Of the Complies Rendus
R,. rho use of albumcn bromide OF silver films.
made orthochromatic with azain and cyanin. Mr..
Jinnmann has obtained very brilliant photographs
~ the solar spectrum. All the colors. secondary
az well as primary, even including the red, APP
noar in all their natural vividness. and that wlV-
ont the use Of any color-screen The exposures Oh
these plates varied from five 20 thirty secohoS'
ON the same theory he also proceeded TO pho'o-
oranh various objects of blended ana complex
colors such as a stained-glass window. some Ora
c.res n plate of oranges surm9unted by red
nonpv and a many-hued parrot. The draperles
and the parrot required exposures OF the plate OIL
fro,n five to ten minutes. In sunIlgh'. anu 'no
window and the oranges Of several hours III d
comnarativcy dim light; but the results op'ainc"
wcrc altogether satisfactory. On other hesa"'''
no accurately fixed the blue of the sky the green
~ foliage and the pale gray oil STONE van
Mr. Iinpmann is confident, therefore, that this
interesting problem is practically solved. IL IT.
n,irs only 10 intensity the orthochromatlc quality
a.
lioht. How much the sensitiveness must DE III
creased NAV be Judged by any one who is accus-
TONED TO practical photography. y plate that re-
ccivcs a vivid impression exposure 10 white
LIGHT for a fraction of q second may be exposed Tor
some time 10 q ned light without being aitectea
in the least But in color photography IL must
rcspond instantancously to the red rays. ana the
yellow. az well az to the white and the blue In
handling such plates the darkroom VIII have
o he really dark and not, a. AZ present., lumined
by the radiance Of ruby lantern.
It. seems to us entirely within the bounds OF
reason TO expect that perfect and pracucable
orbhochromatic photography Will presently he at
famed perhaps on the lines indicated by Mr.
Lippmann PERHAPS by some other method. Such
an achievement requires no greater advance upon
the photography of to-day than the instantaneous
dry-plate system OF to-day marks upon the slow
wct-platcs of a few years ago. We remember
the old days, when had TO pose for many
seconds, and sternly To refrain from winking, In
order to have his portrait made. And now, much
better portraits are made with an exposure liter
ally quicker than a wink. Aye, we are now able
TO photograph the bullet it leaves the muzzle
of the rifle In view of such achievements, he is
II rash conservative who declares that anything
is impossible, even to picture upon the sensitive
plate the thousand hues of an autumnal landscape
each as distinct and vivid as it is upon the
retlna of the eye.