The Pacific commercial advertiser. [volume] (Honolulu, Hawaiian Islands) 1885-1921, 1898-10-19
Long Sought Art Perfected By
Chicago Man.
EXACT REPRODUCTIONS MADE
Hues of the Rainbow Made Ready
for Reprinting in an instant.
Scheme Of Invention.

Color photography has been made
final success by a Chicago man. The
process of using an ordinary camera
and in one-fifth of a second accurate
" photographing, all of the brilliant
| hues of a flower garden, all the con-
trasts in green of landscape, all the
wonders of a summer sky, the decora-
tons of your hat, the bouquet GU your
lapel is now a reality.
And this is all done, not by retouching
nor tinting, nor by laborious processes
after the picture itself is taken. but
done by the sunlight instantly, on the
same second that the picture itself Is
| taken. The discovery and practical de-
velopment is the work of the late
lanes w. McDonough of Chicago. He
has been dead year but the discovery
| has been in the hands OF friends ana
business associates ever since, and IS
about to become public property.
What he discovered is due primarily
to the dirty and nasty condition OF the
| Chicago River. Crossing the river on
the Madison street bridge one day in
I1S7O. Mr.. McDonough noticed on the
surface of the murky water the colors
of the spectrum, caused by escaping oil
from some close-by warehouse. The
thought came to him that the river
would present a beautiful spectacle II
covered with those colors. The second
Thought was as to why that rivers sur
face could not be photographed. From
this thought gradually developed and
grew the process of color photography
(the first ever given TO the world) that
now will always be known as Me
Donoughs.
In the simplest language possible the
process which he created is a color
photography that is purely mechanical
: The ordinary camera is used and the
negatives are produced and deleyoped
by the usual processes, but before eN'
: posing the negative in the camera 9
, Transparent screen ruled with the three
: primary colors. red, blue and green, /:
} interposed between the negative anc
} the object TO be photographed. After de
: veloping the negative positive PLATE
is produced from it. which viewed b!
e itself. does not appear TO differ from
a the ordinary black and white plate
. but when it is laid upon q viewing
= screen ruled with the primary color
|. Cbeing a duplicate OF the taking scree1
e used in the camera) the colors in tn
: object photographed appear.
!; The principle of color photograph
) is a mixture Of colored lights on tn
retina. \ transparent medium is rule
: in fine colored lines, 800 to GOO TO tn
g inch. These lines are red, blue an
Il green. commonly speaking. They ar
-. the fundamentals of the spectrum 9Th
is yellow of school days now being Il
IF jected) and their mixture produce
g white light. In other words, the cole
III of each is such as TO absorb the II
naming two and transmit only its Ow
light. To make a picture it is nece:
sary to place one of these ruled screer
in immediate contact with the sens
? tive surface OF the dry plate and g
Is pose the same as in ordinary phOtt
:, graphy.
5, The sensitive plates must be VIII;
Of are known as isochrOmatic plates
g that is, sensitive to all the coIors
a the spectrum. After a negative
made, a positive is also made by COZ