File:The American annual of photography (1917) (14597434739).jpg

Identifier: americanannualof1917newy (find matches)
Title: The American annual of photography
Year: 1917 (1910s)
Authors:
Subjects: Photography
Publisher: New York : Tennant and Ward
Contributing Library: Harold B. Lee Library
Digitizing Sponsor: Brigham Young University

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rlydesirable for portrait work, and if a warm brown ink is usedthe effect can hardly fail to be good. It would be difficult to find a better sensitizer than the car-bon sensitizer recommended by Henry W. Bennett, but a spiritsensitizer is often desirable, since this makes possible morerapid work. A bath-sensitized paper will require two or threehours to dry, depending on the atmospheric conditions,whereas one sensitized with a spirit sensitizer will dry in fromfive minutes to half an hour. The Autotype sensitizer is verygood for this purpose, but more convenient—because moreflexible—is one made up from a saturated solution of sodiumbichromate in conjunction with alcohol. The stock solu-tion is Water 4 ounces Sodium bichromate 1920 grains For use take Stock I to 8 drams Alcohol 95 % up to 2 ounces This is applied to the paper by means of a Blanchard or flatJapanese brush, and if a constant quantity is used for a givensize of sheet the results will be constant. The stronger mix- 246
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THE PICTURE BOOK. ARTHUR DARING 247 ture is to give soft prints from strong negatives, and viceversa. It will be well to obtain, if possible, the imported brushes,but if this cannot be done the fitch stipplers, cut slanting,to be got from a dealer in painters supplies, will be foundquite as satisfactory though not so durable, and are muchcheaper. It is advisable to clean the brushes with gasolineimmediately after use, and to keep them in cones of stiff paper,that they may keep their shape. Much cheaper than the imported inks, and quite as good,are the stiff litho inks to be obtained from a dealer in printersinks. These may be got in quarter pound tubes, and it will befound that black and burnt umber are about all that will beneeded for portraiture, a very pleasing brown being made bymixing them in approximately the proportion of one part ofblack to two of burnt umber. The contrast of the print depends on the quality of thenegative, the strength of the sensitizer, the degree of soaking

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