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(graphic arts)
A process in which two halftone cuts, one with a screen angle 30° different from the other, are made from the same black-and-white photograph, and the picture is printed in two tones, usually black and a color such as blue or green.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.



two-color reproduction from a monochromatic halftone original (for example, a black-and-white photograph). Two screen negatives are made from such an original, without using a light filter; one of the negatives has higher contrast, and the other is softer. The first negative is photographed with the screen in the normal position; the other, with the screen rotated through 30°-45°. The plate from the negative with higher contrast is used to print in black (the contour plate), and the plate from the second negative is used to print in colored ink, usually pale yellow, blue, or green. The rotation of the screen when photographing causes a shift of the points of the screen of the first plate with respect to the points of the second plate; as a result, moiré does not occur and the screen points of one color do not overlap those of the second upon printing. Duotone intensifies the effect of a monochromatic halftone image.

The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.
References in periodicals archive ?
Caption: Victor Burgin, Possession, 1976, duotone lithograph, 47 3/4 x 33 1/8".
The 190 duotone photos comprising "Maine On Glass: The Early Twentieth Century in Glass Plate Photography" were selected from 22,000 glass plate negatives created by the Eastern company between 1909 and World War II.
214 duotone plates, 21 color plates, 9.75" x 12.5", 3 gatefolds
Dietrich Floeter's duotone photographs and author Barbara Siepker's captivating historical narratives include personal anecdotes on each cottage.
On page 26 of the March issue, you have the type reversed out of a black and blue duotone. It would have been more legible if it were reversed out of a straight black background--or better yet, if it were not reversed at all.
Range Rover SVAutobiography - Available in duotone, with a 550ps supercharged V8 engine, and hand-finished at SVO's Oxford Road facility.
From how the eagles are raised and trained to how they are released after six to eight years, Hunting with Eagles in the Realm of the Mongolian Kazakhs presents an exquisite blend of ninety duotone photos with coverage of both the eagle hunters and why their ways are dying out.
The image in the mind's eye comes in the coppery duotone of the antiguated, early twentieth-century cameras, a portrait from a lost age.
The collection contains nearly 300 photographs and original drawings by BrassaA, more than 200 of which are reproduced in duotone. Sylvie Aubenas is Chief Curator of the Department of Prints and Photographs at the Bibliotheque Nationale de France.
The interior is as luxurious as you would expect, with jet black and red duotone bucket seats offering both comfort and lateral support, while the dashboard and doors are embossed with the finest leather and carbon fibre elements.