File:The American annual of photography (1912) (14765416012).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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After coating several sheets of paper it will usuallybe found that the brush contains enough of the mixture tocoat another, without taking any more of the stock solutions. POINTS TO BE NOTED. No metallic substance may touch the sensitizing or stocksolutions without damage. The paper should be bone-dry within ten minutes after sen-sitizing. Graduates and brush should be washed clean before puttingaway. If several pieces of paper are to be coated for differentdegrees of contrast the brush should be washed before apply-ing a different formula. The addition of potassium chlorate in the sensitizer increasescontrast. Brush marks can result only from extreme carelessness. It is easier and more economical to coat large sheets andcut to size than to coat small pieces of paper. Rough papers are slightly easier to coat than smooth. Save clippings, waste prints, and all paper, etc., that hasany of the sensitizing solution on it, as it can be sold, thustending to diminish the cost of the work. so
Text Appearing After Image:
O. VON ROSENBERG. ARTIST. LOUIS FLECKENSTEIN. The ferric oxalate must be fresh, and in this condition shouldconsist of clear, bright green scales. If it is brownish, or ifthe scales stick together in the bottle, it is unfit for use. Keep all solutions in amber glass bottles, in the dark. PRINTING. Printing is conducted exactly as with commercial papers,being very slightly slower than is the case with the ready-made article. In printing on very thin transparent papers itis advisable to print by time, using test slips, as the image isonly slightly apparent before development. In making multiple prints a note should be kept of the timerequired for printing, as it will be almost impossible to judgeof the secondary printings by inspection. DEVELOPMENT. This also is the same as with the commercial papers, a hotor concentrated developer giving soft prints of a warm tone,a weak or cold developer producing greater contrast andcold tones. The addition of bichloride of mercury to thedeveloper al

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