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44 History of Three-Color Photography
must not be confounded with that in which a black or grey key-plate is used in addition to the three colors.
54. "Die Dreifarbenphotographie," 1897, 1st edit. 77; 1902, 2nd edit, 92; 1912, 3rd edit. 93; Klein's translation, "Three-Color Photography," 1915, 72; Wien. Mitt 1906, 179; Brit. J. Phot. 1906, 53, 693.
55. E.P. 27,023, 1895; Brit. J. Phot. 1905, 52, 1028; 1906, 53, 15, 371, 397, 719; 1907, 54, 853; Penrose's Annual, 1905, 11, 9; 1906, 12, 17; F.P. 358,448; Le Procede. 1906, 8, 60; U.S. P. 884,254; D.R.P. Anm. 4,451, Kl, 57b, patent refused; abst. C. A. 1907, 1, 1647 ; 1908, 2, 2340. Cf . C. Gravier, Bull. Soc. f rang. Phot. 1906, 63, 273. Cf. A. E. Bawtree, Penrose's Annual, 1925, 27, 44.
56. Jahrbuch, 1905, 19, 83.
A. R. Trist and A. E. Bawtree, E.P. 202,042, 1922; abst. Sci. Ind. Phot. 1924, 4, 170; Brit. J. Almanac, 1925, 312, proposed to falsify the colors of the original or a screen-plate transparency thereof to a predetermined extent, so as to obtain an accurate copy of the original. A color chart was prepared and photographed in colors and the latter then modified by means of colored celluloid till the reproduction was exact. The original and the color chart then furnished a guide as to the necessary modifications of the colors of the original so as to reproduce correctly. For a landscape, which can not be modified, a transparency was made and modified. G. Jeanne, F.P. 467,909, 1913 proposed to use five colors, instead of three for ordinary polychrome and photo-mechanical work ; for instance, a light and dark blue, a light and dark red and a yellow.
As to the use of grey in three-color printing, see F. T. Hollyer, Brit. J. Phot. 1912, 59, Col. Phot. Supp. 6, 48; E. G. H. Lucas, ibid. 43, 55; A. J. Newton, ibid. 48, 56.
On the pigment difficulty see C. W. Piper, Brit. J. Phot. 1913, 60, Col. Phot. Supp. 7, 5; 1915, 62, Col. Phot. Supp. 9, 5, 15; E. H. Gamble, ibid. 1915, 62, ibid. 9, 28; P. G. Davidson, ibid. 20.