The times. [volume] (Washington [D.C.]) 1897-1901, 1900-07-22

| strument Is necessary to carry out tn
sense OF color so the processsis far from
being the one long desired, which Is Il
produce colored prints that may be framed
and hung on the wall.
Through this viewing device. however
color images OF marvellous fidelity are OBJ
tanned, giving all qualities OF texture
| sheen, translucency, and atmosphere to q
| degree impossible to any color print or
! paper. Pictures O. the old masters can be
reproduced and seen in the photochromo-
| scope with all their original qualities.
| Scientific objects. specimens for natural
| history collection, beauties OF landscape,
/ botanical specimens. tapestries. and textile
! fabrics of all kinds may be studied though
| these color images as satisfactorily as from
| reality. The color records take up no
more room than ordinary photographs. and
if the cost and difficulty of the production
| can be decidedly reduced this form OF color
! photography may be utilized to great ad-
| vantage in schools. in medicine. in many
| of the other sciences. and in commercial
| business. where 1t could represent the
quality and appearance Of goods more
satisfactorily than any print or fragmen-
tary sample
Colored photographs Of the most beau
tiful species of butterflies have been
among the greatest triumphs OF this pro-
cess and not the smallest element OF the
beauty of the original is lacking In the re-
production. The miniature kromskop is the
latest and simplest development of the ap-
paratus and is less expensive than the or
iginal instrument.
Another method Of color photography
finding great favor today applies the same
principles in another way. The light Is
projected upon the plate. not through three
hut cfnSalv
ruled in orange, green, and violet. These
lines are ruled on gelatine plates in pig
ments made up as inks. and these are from
500 to 1,O00 to the inch, although when the
lines exceed 400 to the inch the eye ceases
to be annoyed by them. The resultant lines
upon the positive register. Of cour ;e. the
degrees in which the three color sensa-
lions would have been produced.
Then a second screen, ruled in red,
green, and violet. and gagged exactly in
accordance with the first, is moved over
the positive, producing waves OF all coiors
until 1t reaches such a position that the
red lines fall exactly over the lines record
ing red. sensations, etc., when the picture
appears In vivid and realistic color. In this
process, as In the other described. seeing
apparatus is necessary as well as taking
apparatus; but as the whole secret in this
case lies In two adjustable screens, both
the taking and the seeing instruments are
much more simple.
Within the last four years a Frenchman
has attracted great attention by his as
sertions concerning new and efficient form
Of indirect color photography, but as he
has maintained absolute secrecy in regard
to certain features Of his process. scient-
lists have accepted his results with some
doubt and have withheld Judgment. Mem
Der Of various English and French and
American scientific societies have, how
ever, Investigated the method as far as pos
sible, and have reported that It seems to be
legitimate scientific process, although
the inventor reserves information as to the
ingredients of solution used by him.
His negative is taken on ordinary geia-
tine plate, prepared BY treatment with the
solution Of unknown composition. The
negative obtained shows no trace OF color.
A print is taken from 1t ON albuminized sill
yer paper treated with the solution. This
print shows no color. When dry it is
washed with the secret solution and treated
successfully with color solutions In red,
blue, and green, under which process the
print assumes the natural colors of the
object photographed. This process has an
advantage in producing permanent print,
but the colors are faint and the image not
to be compared In fidelity and beauty with
those secured through the other methods
described.