The Dictionary Of Photography

A True Historic Record Of The Art & Practice Of Photography 100 Years Ago.

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Bromide Paper
as to the cause for the desire for warm tones on bromide paper. The Eastman Company first suggested, we believe, the applica-tion of uranium to the finished print on their transferrotype paper, to give a warmth and colour which could not be obtained by ordinary development, but they pointed out that it was essentially a process of intensification ; and one cannot help feeling very strongly that it is so, and that it has a tendency to strengthen up the distance so as to destroy to some extent the atmospheric effect. In Anthony's International Annual, 1889, p. 266, I stated that experiments had been commenced, which would enable any one to obtain warm tones even to purple shades on bromide tints; and in the succeeding volume, 1890, p. 340, I suggested bleaching the image with a chlorising agent, and then darkening with sulphantimonite of soda or a weak developer. Senier recommended the chlorising of the image and redevelopment, and A. R. Dresser suggested bleaching with mercury and re-development with quinol. In his excellent book, " Leitfaden fur den Positiv-Entwicklungs-process auf Gelatine-Emulsions Papier," etc., Dr. E. A. Just suggests the use of the alkaline developers for obtaining warm tones; and Dr. Stolze (" Photo-Nachrichten," 1891, p. 4) gives a summary of his experiments to obtain warm tones by various developers, and finally suggests giving a long exposure, and developing with the following: -
A.
Sodium sulphite ... ... ...        ... 20 parts.
Eikonogen ... ... ... ...        ... 4 ..
Water ............        ...    300 ..
B.
Potash carbonate ............ 50 parts.
Water           ...............300 ..
To obtain brownish tones, the actual developer must be com-pounded as follows: -
Solution A............... 50 parts.
B............... 20 ..
Water           ............         150-180 ..
To every 100 parts of this add
Solution of bromide of potash (1 : 10) ... 5-10 parts.
Brown or blackish brown tones only are to be thus obtained.
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