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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fact after a verylittle practice it is the simplest process of all. I have taughtit to a number of people and have yet to find one who cannotmaster enough of the fundamental principles to be able tomake a good carbon print inside of the first hour. If themethod here described is followed good carbons are as simpleas dark-room prints. In order to fully understand the process it may be per-missible to give an outline of the method of making the 296 pictures. In the first place the picture is printed on so calledcarbon tissue, which is simply a paper heavily coated withpigmented gelatine, which is sensitized by immersion in bichro-mate of potash. The action of light renders the gelatineinsoluble wherever it strikes, but the light never penetratesdeeply enough to go down to the paper support, hence thereis a layer of soluble gelatine of varying thicknesses coveringthe entire support. In order to make a picture that will renderall the tones of the negative the insoluble skin of gelatine on
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COMPANIONS. JANE REECE. the surface is transferred to a second support called the trans-fer paper, and the remaining soluble gelatine is washed offwith warm water. The operations sound rather formidable,but as a matter of fact 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 pap

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