词条 | Bitumen of Judea |
释义 |
The bitumen, initially soluble in spirits and oils, was hardened and made insoluble (probably polymerized){{synthesis-inline|date=January 2016}} in the brightest areas of the image. The unhardened part was then rinsed away with a solvent.[4][5][6] Niépce's primary objective was not a photoengraving or photolithography process, but rather a photo-etching process since engraving requires the intervention of a physical rather than chemical process and lithography involves a grease and water resistance process. However, the famous image of the Cardinal was produced first by photo-etching and then "improved" by hand engraving. Bitumen, superbly resistant to strong acids, was in fact later widely used as a photoresist in making printing plates for mechanical printing processes.{{Citation needed|reason=content of this paragraph is not contained in Newhall ref, which is also incorrectly cited|date=January 2016}} The surface of a zinc or other metal plate was coated, exposed, developed with a solvent that laid bare the unexposed areas, then etched in an acid bath, producing the required surface relief.[7]{{failed verification|reason=Info on photolithography is not in Newhall reference, which is incorrectly cited - Newhall was last published in 1982|date=January 2016}} References1. ^[https://web.archive.org/web/20161223171715/https://books.google.com/books?id=cVHBqhdIEisC&pg=PA319 History of Polymeric Composites, edited by Raymond Benedict Seymour, Rudolph D. Deanin, p319] {{photography subject}}{{photography-stub}}2. ^{{cite book|last1=Newhall|first1=Beaumont|title=The History of Photography: from 1839 to the present|date=1982|publisher=Museum of Modern Art|location=New York|isbn=978-0870703812|edition=5th}} 3. ^Eder History of Photography} p. 203 4. ^1 {{cite web|title=The First Photograph|url=http://www.hrc.utexas.edu/exhibitions/permanent/firstphotograph/process/#top|website=Harry Ransom Center, University of Texas at Austin|accessdate=26 February 2016}} 5. ^Niépce Museum history pages {{webarchive |url=https://web.archive.org/web/20070803222723/http://www.niepce.org/pagus/pagus-inv.html |date=August 3, 2007 }} 6. ^Hirsch, Robert. Seizing the Light: A History of Photography. New York: McGraw-Hill, 2000. Print. 7. ^Beaumont Newhall, "The History of Photography," 2001, p 14. {{ISBN|0-87070-381-1}} 1 : Photographic processes dating from the 19th century |
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