The times. [volume] (Richmond, Va.) 1890-1903, 1890-04-25

REPRODUCTION or THE BEAUTIFUL
SHADES or NATURE.

The Science still Tar from Perfect-ProE-
ress OF the Orihochromaiie Branch Of
Photography Color Of Hair. Eyes aud
Clothing obtained.
Orthochromatc 0r correct color photog.
raphy is the nearest approach which photoe-
raphers have set made toward producing the
beautiful and various color shades Of nature
in the camera. Nooan photograph the color
values in almost true relation, but rs yet
the problem 90 photograph exuctly the col
ors themselves remains uns0lyed.
Perhaps Do other branch OF photography
has received So much attention a. this. No
other is So interesting an so full Of promise.
i has been thedroam n photographers % re-
produce with their cameras tue beautiful
colors Of nature as accurately as they are
able 20 depict ITS form and lights and shadows
ever since Daguerre, the ambitious young
scenic painter of Paris, exclaimed. on Success
fully completing bis irst wonderful photo
graphic experiments "Why cannot l retain
these inimitable wonders which the suns snys
draw 10 the focus Of my lensl Why cannot
! fix the image, engravo 10 f0rever'
Experiments have been numerous aud con-
tinuous in this direction ever since the birth
Of photography, hity-one years ago. Often
il has been announced that 40 last the great
secret was discovered, but always 20 result
only in disappointment, for as yet there BIAS
been found no way by which the colors them
selves can be photographed.
SOME ADVANCEMENT.
Much has been accomplished. however,
even if the natural colors themselves cannot,
a. yet, be exactly reproduced by lens and dry
plate We can photograph yellow, green
and red so that they can easily be distin-
guishcd i'm the finished picture, whereas, for
merlv. no difference whatever could Toe seen
between these col0rs In the photograph. In
like manner, blue, violet and indigo may now
be photographed so that difference is shown
in color values. instead of reproducing them
an perfectly white, which was formerly the
case.
A bright yellow color on the old ordinary
plate was always photographed O. dun black,
and very dark and dun blues would appear
clear whites. though in the natural subject
which appeared quite black in the photo
graph This unique result was obtained on
the old plate because yellow, Ike green anil
red. are n0n-actiuic, or phoioeraphically in-
active colors, while blue and the c0iora at Tie
other end of the spectrum are very powerful
IN actinic rays.
10 therefore happened that tine n0n-actinic
colors, whether bright or duil. impressed The
sensitive plate bat feebY aui iu the same de-
gree, because SD little Photographic light was
Transmitted from these c0i0r,; while the blue,
the violet and the indigo shades. no matter
how dull they might appear 90 nature, being
very active ph0touaplicaly, impressed Gle
sensitive plate Co q great degree aud clms
out IN the photograph much brighter ,nan
the ycllows and reds. which We're ia reality
more brilliant color.
HOW COLOR Is OBTAINED.
So 10 was that tlcboaltiiul tnts OK au.lm
foliage or the glorious cei0rs ri an October
sunset could mot at all Dee accurately depicted
by the camera. For the same reason % paint
ing could not Doe tutAuily copied, AND a
great defect was apparent DO process other
wise quite perfect
The problem was toprcloro a sensitive sup
face sothat the different c1lors. while NOT im-
pressing their exact shades on the plato, would
40 least impress themselves differently, and
in "a way that they could be- distinguished one
from another This has at last actually been
accomplished
There are several methods by which tao
correct values of natures beautiful col0ring
may be preserved m O photograph. but par
hans the most effective a- aeu as the simplest
process +. the ono perfected by Professor
Charles Earmati of fhe CDartauqua School
of Photography. aud associate editor of The
Photographic Times By his method auy
rla,e may De rendered orfirohromatie. OPP
.oi....ln-itire h.. -inr,i, latIir~.itin certain
..i,ti,-. aud l,-i,...,..' d. ia f00 camera with
a color screen irf,rnaeei b.,.reen 10 and the
is.s Tba rrocs.s ORIGINATED fla Germany
but was ~reativ imnrored bv Professor Enr-
MANN
Two solutions aro required. One "a prciimi-
nary bath. consisting ~ one dram of ammo.
mia to seven drains of water. and the other.
the color bath. which contains one and g.
half drains of orvthrosine-ad ye-two drains
of ammonia and five and half ounces of
water.
The plate is first immersed in the prclimi-
nary bath and allowed 20 remain therein for
about three minutes. Itis then removed from
This solution aud allowed Co drain. Without
washing DO is then plunged ln the coioung
bath. where tits allowed foreman not LONGER
than seventv-fvo seconds. The plate is tacn
sci ND i'm a dark. dry place until ra1dv foru use.
CARE OF THE PLATES.
tnav De exno.sl in the camera while stin
we. fl necessary. and VIII De found % he
more sensitive while In that condition: but as
q general thing it is safer % wait until the
plate has become perfectly dry before expos
Ing it ia the camera
Plates thus rendered color sensitive are dc-
yeloped in the usual manner aud lxel aud
washed in the ordinary way; bu, being exc
uenely sensitive TO rel, orange aai yellow
the colors which ordinarily DO not imnie
i.... .