DEVELOPERS AND THEORY OF DEVELOPMENT 



333 



Table I. — Organic Compounds Suggested for Photographic Development 



{Continued) 



Compound 



Discoverer 



Date 



Heterocyclics 



o-Dihydroxyquinoline . 

 p-Diliydroxyquinoline . 

 o-Diaminoquinoline. . . 



jB-Diaminoquinoline . 



o-Hydroxyhydromethyl-quinoline 



o-Hydroxyhydropropyl-quinoline 



o-Hydroxyhydroethyl-quinoline 



o-Hydroxyhydrobutyl-quinoline 



Tetrahydro-dihydroxyquinoline 



Tetrahydro-ana-amino-o-hydroquinoline 



Tetrahydro-o-hydroxyl-quinoline-ana-sulphonic acid . 



o-Hydroxy-trihydromethyl-quinoline 



o-Hydroxy-trihydroethyl-quinoline 



o-Hydroxy-trihydropropyl-quinoline 



o-Hydroxy-trihydrobenzyl-quinoline 



o-Hydroxy-trihydrophenyl-quinoline 



o-Hydroxy-trihydroacetyl-quinoline 



o-Hydroxy-trihydrobenzoyl-quinoline 



o-Hydioxy-trihydromethyl-quinoline carboxylic acid . 

 l-Phenyl-2:3-diinethyl-4-sulphamino-5-pyrazolone. . 



1-Ascorbinic acid (Vitamin C) 



d-Ascorbinic acid (Isovitamin C) 



l-Phenyl-3-methyl-4-amino-5-pyrazolone 



l-p-Chlorophenyl-3-methyl-4-amino-5-pyrazolone. . . 



3-Ainino-4-oxo-2-imino-tetrahydrothiophene 



4:5-Diamino-2:6-dihydroxy-pyrimidine 



6-Hydroxy-2:4:o-triamino-pyrimidine 



2:4:5:6-Tetramino-pyrimidine 



2:5-Diamino-4-methyl-pyrimidine 



2:4:5-Trihj'droxy-6-amino-pyrimidine 



6-Amino-8-methoxy-l:2:3:4-tetrahydro-quinoline. . . 



Tetrahydro-quinoxaline 



6-Aniino-l:2:3:4-tetrahydro-quinaldine 



6-Amino-8-methoxy-l:2:3:4-tetrahydro-q>iinaIdine. . 



,')-Aminodihydro-2-methyl-indole 



6-Amino-benzothiazoline 



Lumiere & Seyewetz, (Eder, Jahrbuch, 



1892, 93) 

 Lumiere & Seyewetz, (Eder, Jahrbuch, 



1892, 93) 

 Lumiere & Seyewetz, (Eder, Jahrbuch, 



1892, 93) 

 Lumiere & Seyewetz, (Eder, Jahrbuch, 



1892, 93) 

 Lembach & Schleicher, D.R.P. 89,181 

 Lembach & Schleicher, D.R.P. 89,181 

 Lembach & Schleicher, D.R.P. 89,181 

 Lembach & Schleicher, D.R.P. 89,181 

 A.G.F.A., B.P. 371 

 A.G.F.A., B.P. 371 

 A.G.F.A., B.P. 371 

 A.G.F.A., B.P. 371 

 A.G.F.A., B.P. 371 

 A.G.F.A., B.P. 371 

 A.G.F.A., B.P. 371 

 A.G.F.A., B.P. 371 

 A.G.F.A., B.P. 371 

 A.G.F.A., B.P. 371 

 A.G.F.A., B.P. 371 

 Scheithn, U.S. P. 930,091 

 Mauer & Zapf, Phot. Ind 

 Mauer & Zapf, Phot. Ind 

 I.G. Farb., B.P. 459,665 

 I.G. Farb., B.P. 459,665 

 I.G. Farb., B.P. 459,665 

 I.G. Farb., B.P. 479,446 

 I.G. Farb., B.P. 479,446 

 I.G. Farb., B.P. 479,446 

 I.G. Farb., B.P. 479,446 

 I.G. Farb., B.P. 479,446 

 I.G. Farb., B.P. 478,345 

 I.G. Farb., B.P. 478,345 

 I.G. Farb., B.P. 478,345 

 I.G. Farb., B.P. 478,345 

 I.G. Farb., B.P. 478,345 

 I.G. Farb., B.P. 478,345 



1935, 5, 

 1935, 5, 



1892 



1892 



1892 



1892 

 1895 

 1895 

 1895 

 1895 

 1896 

 1896 

 1896 

 1896 

 1896 

 1896 

 1896 

 1896 

 1896 

 1896 

 1896 

 1909 

 1935 

 1933 

 1937 

 1937 

 1937 

 1938 

 1938 

 1938 

 1938 

 1938 

 1938 

 1938 

 1938 

 1938 

 1938 

 1938 



Aliphatic 



rf-Aminoacetic acid ethyl ester I.G 



1937 



photographic developers. Hydroqiiinone, as a developer, is more understood than 

 any other agent, but there still remains much doubt as to the exact nature of the 

 reaction products of development caused when even this much-examined agent is used 

 in a developer along with alkali, sulphite, and bromide. 



l:4-Dihydroxybenzene, or hydroquinone (hydrochinone or quinol), is slightly 

 soluble in cold water, very soluble in hot water, ether, and alcohol, and insoluble in 

 benzene. Developing solutions of hydroquinone are practically inert at temperatures 



