History of color photography (1945)

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362 HISTORY OF COLOR PHOTOGRAPHY Of these, it is only the 1:3:5 substituted compound that does not have developing properties. This was as far as the disclosures of the Lumieres, Seyewetz, and Andresen went. In 1907 Dr. B. Homolka (cf. above) established that indoxyl and thioindoxyl had developing properties. He also suggested that the leuco derivatives of di and tri-phenyl methane dyes had the requisite structures, hence should be capable of developing a latent image. Lumiere and Seyewetz tested several leuco tri-phenyl methane dyes and failed to notice that they had any developing properties. This was in keeping with a study which they made upon the effect of a ketonic group upon the developing properties of a substance (Brit. J. Phot.y Vol. 44 (1897), p. 665). In general, they found that a ketone group by itself had no effect, provided an aliphatic radical was present on one side of the molecule, and a group with developing characteristics on the other. Thus HO--CH3 OH develop vigorously. If an unsubstituted phenyl group replace the methyl, the compound still has developing properties. The substance OH OH tri-oxy-benzophenone develops quite vigorously, but not as well as the corresponding aceto-phenone. But if any amino or hydroxyl group is present in both of the phenyl groups, the compound loses its developing power. Since most of these substances are colored, their application to color development is immediate. It does not appear, however, that they were studied from this point of view. In some later work, Homolka extended the number of odd substances which developed a latent image and deposited at the same time insoluble dyes (Phot. Korr.t Vol. 51 (1914), p. 256 and 471; Vol. 53 (1916), p. 201; Vol. 56 (1919), p. 387; Vol. 59 (1922), p. 29). These were oxy-iso-carbostyril, whose structure is and symmetrical di-methoxy-pyrogallol. -OCH3