US1071559A

US1071559A - Method of making colored photographic reproductions.

Info

Publication number: US1071559A
Application number: US60219611A
Authority: US
Inventors: John Lewisohn
Original assignee: Individual
Current assignee: Individual
Priority date: 1911-01-12
Filing date: 1911-01-12
Publication date: 1913-08-26
Anticipated expiration: 1930-08-26

Description

UNITED I STATES PATENT. OFFICE.

J'OHNLEWISOHN, OF NEW YORK, N. Y.

METHOD OF MAKING COLORED PHOTOGRAPHIC REPRODUCTIONS.

No Drawing.

To all whom, it may concern:

Be it known that I, JOHN LEWISOHN, a citizen of the United States, and a resident of the city of New York, borough'of Man-. hattan, in the county and State of New York, have invented a new and Improved Method of Making Colored Photographic Reproductions, of which the following is a full, clear, and exact description. I

My invention relates "generically to a method of making-reproductions and specifically relates to the utilization of the blue coloration in a blue-print as one of the primary colors to combine with suitable red and yellow color washes or diluents to modify the blue effect to form the desired color effects, and, at the same time, to retain the fine shade values and soft relatively true tones of the original blue-print.

My invention pertains to a process or method in which I make use of the original blue color of a blue-print reproduction as one of the primary spectrum colors, and

make use of red eosin for the red and aurantia for the yellow. By the mixture of these three colors, I am able to obtain substantially any of the spectrum colors.

A. negative of a colored object is made preferably on an ordinary orthochromatic photographic plate, having as a basis the silver emulsion, and preferably using a yellow colored screen, in order to obtain the best color values. From such a negative, an ordinary blue-print is made, which' blue print will, of course, show up the different shade values in their proper proportions. This blue-print is then colored either wholly or in part, by applying dye or paint, but 'n'eferablyred eosin and aurantia, or a mixture of the two, to modify the blue to form any of the spectrum colors, the blue coloration showing through the applied washes with more or less intensity depending upon the extent of the coating wash. Should it be desired to make all or any material portion of the print either red or yellow, or any other color, in which blue is not used, the blue of the blue-print is either wholly or partially dissolved by a weak solution of nitrate of silver, which will fix the colors, and, at the same time, will gradually bleach out the blue. Further, the blue-print may Specification of Letters Patent.

be washed with this solution, if it is desired to merely weaken the blue color of the object, after the eosin or aurantia has been applied, or a mixture of the two, to form K any of the spectrum colors involved in these two primary colors. Should it be desired to restore the blue locally or entirely, or to darken the blue color, the blue-print is respectively touched up or bathed with a solution of ferric chlorid, and this ferric chlorid may be applied in stronger solution or in succession until that part of the object is practically black. Instead of painting or bathing the entire print in any one of these colors, certain spaces may be touched up locally, in order to either darken or lighten those particular parts. In addition to this local treatment, the entire print may be submerged in either of these primary colors, or any combination of the same, to give the different color background and a difl'erent tint to the entire picture.

Having thus described my invention, I claim as new and desire to secure by Letters Patent: 1

1. The process of reproducing on blueprints from yellow screened negatives, the color eflects resembling the natural colors and tones of objects while retaining the shade values inherent in such prints, which process consists in locally treating the shaded portions which should be red-blue with a thin red wash, the shaded port-ions which should-be blue-yellowwith a thin yellow wash, and the shaded portions which should be deficient in blue with a blue dissolving substance.

2. The process of reproducing on blueprints from yellow screened negatives, the

color effects resembling the natural colors 3. :The process of producing on blue prints Patented Aug. 26, 1913.

Application filed January 12, 1911. Serial No. 602,196.

a plurality of color efi'eots which consists name to this specification in the presence of in treatingf a blue print which displays a two subscribing witnesses. plurality o shades or tones, or an portion of a blue print displaying a plui'ality of i 7 JOHN LEWISOHN' shades or tones, with a thin uniform Wash Witnesses: of a, pigment of a hue other than blue. W. S. ORToN,

In testimony whereof I have signed'my PHILIP D. ROLLHAUS.