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Process Engraving; Formulas, Equipment, and Methods of Working

Process Engraving; Formulas, Equipment, and Methods of Working


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Purchase of this book includes free trial access to www.million-books.com where you can read more than a million books for free. This is an OCR edition with typos. Excerpt from book: weakness, it is taken out of the holder and another one substituted for it. The composition of the silver bath is very simple, viz.: Distilled Water Nitrate of Silver. (Enough of this is dissolved in the distilled water to test 40 on the Hydrometer.) A few drops of Nitric Acid C. P. (Enough to turn blue litmus paper red.) It should now be slightly iodized. This is done by flowing a plate with collodion, placing it in the bath and allowing it to stand there some time, from an hour or two, to all night. The bath is then ready for use. It may be used in a covered tray or such, but is mostly kept in a glass bath holder, Fig. 17, the collodionized plate being let down into it by means of a plate dipper, Fig. 18. The plate should soak for about four minutes to allow the requisite amount of silver to deposit on it, after which it is taken out, drained, placed in the plate holder of the camera and exposed. As the bath is used it gradually becomes weaker in strength, because of the deposition of silver upon the plates, and each succeeding plate must be allowed to stay in the bath a longer time to take up enough silver to make a good sharp negative. The plate may be flowed with collodion, and placed in the bath in daylight, as the bath itself is not sensitive to light, and the plate is not yet coated. Whenthe plate is removed, however, to be put into the holder, the room must be dark, for the emulsion is then sensitive to light, and is exposed to the copy in this condition. Sensitiveness to Light. Wet plates are by no means as sensitive to light as are dry plates, and while the dark room should be tight, it need not be as hermetically sealed as is needful for the latter. The light used to work with need not be dim either, for the wet plate is almost as insensitive to ye...


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Product Details
  • ISBN-13: 9780217745338
  • Publisher: General Books
  • Publisher Imprint: General Books
  • Height: 246 mm
  • No of Pages: 30
  • Spine Width: 2 mm
  • Width: 189 mm
  • ISBN-10: 0217745334
  • Publisher Date: 04 Feb 2012
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 73 gr


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