File:The American annual of photography (1914) (14800621683).jpg

Identifier: americanannualof28newy (find matches)
Title: The American annual of photography
Year: 1914 (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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t they are very simple mechanical opera-tions and require no chemicals at all, and very little skill. Wewill take up the various operations in detail in the followingparagraphs. The materials required are inexpensive, and include carbontissue, carbon transfer paper, flat scraper squeegee, proofpaper, and bichromate of potash or bichromate of ammonium.The paper comes unsensitised and must be sensitised before 297 use, which is done by simply immersing the tissue in a solu-tion of bichromate of a strength of about one ounce to aquart of water. Immerse the paper for three minutes, lay itface down on a sheet of glass, remove the surplus solutionwith the squeegee and hang the paper up to dry in a darkplace. A good way to sensitize is to do it after dark and hangthe paper up in a warm room, taking it down early in themorning. If the curtains are pulled down there will hardlybe enough light get in to damage the tissue, as it is onlyslightly more sensitive than solio. The paper to work at its
Text Appearing After Image:
A WINTER MORNING. GEORGE R. BOSWORTH. best should dry in four hours or less, which it will do in awarmed room, especially in the winter time. The sensitizedtissue will keep for several days if protected from the air.The easiest way to do this is to keep it under pressure in aprinting frame in which you have put some black paper toprotect it from the light. The paper is printed about the same length of time that itwould take to print a light solio proof from the same negative,one that will just show the detail wanted in the high lights.Note how long this takes and print the carbon the same time.In printing be sure that the edges of the negative are allcovered by the rebates of the frame, or else by black paper. 298

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