File:The American annual of photography (1912) (14579259778).jpg

Identifier: americanannualof1912newy (find matches)
Title: The American annual of photography
Year: 1912 (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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be warm and dry, so that the sheets will be perfectly dry in 15 to 20 minutes. If any of the sensitizing solution gets on the glass when coating the paper, wipe the glass dry with a piece of tissue before coating the next sheet.After sensitizing three or four sheets, wash the brush out thoroughly and wring it dry, and so on till all the sheets are finished. The dried kallitype paper is as sensitive to moisture as platinum, and should not be unduly exposed to dampness. In fairly dry weather it will keep without special care several weeks but on humid summer days it is well to use it up within a few hours. Kallitype prints very much the same as platinum, a faint purplish image on a lemon-yellow ground, but is considerably quicker. In sunlight a fairly strong negative prints in about two minutes. When over-printed the shadows print out in a brown tone. In making a number of prints from one negative they should be timed all exactly alike instead of judged, to insure uniform results when developing. 186
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KALLITYPE PRINT ON ROUGH LAIDPAPER; SOFT DEVELOPMENT. Illustrating Article Why Not Kallitypef by George P. Swain. For developing, make up the following stock solutions (dis-tilled water not being necessary) : No. I—Water 32 oz. Rochelle salts 2^ oz. No. 2—Boiling hot water 32 oz. Borax ji^ oz. When cool add Rochelle salts 2^ oz. No. 3—Water 32 oz. Sodium acetate 4 oz. Ready for use in 48 hours. Brown tones are obtained by mixing No. i and 2. The moreof No. I the warmer the tone. I prefer a developer of 8ounces, of No. i with i ounce of No. 2. No. 3 gives a purplish-black tone and should be modified as follows: No. 3—Solution 8 oz. Tartaric acid 20 gr. Phosphoric acid, 50% ^ dr. Next comes the remarkable variation in the quality of the developed prints obtained by the use of the potassium bi-chromate solution (the same as used in the sensitizer). For the softest possible prints use the developers without the additions of any bichromate. Increasing contrast is then secured by the

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