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is a photo copying approach that uses a wet colloidal diffusion transfer technique patented by Yutzy, H.C. and Yackel, E.C. (1947) The light source is projected to the top crossing the negative being reflected -more or less, according to the color- against the original to be copied exposing the
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Finally, the two sheets are peeled apart, obtaining a slightly damp copy of the original, that has to lay on some surface while waiting to dry-out.
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This wet negative is pressed against a sheet of sensitized copy paper, and fed back through the rollers, giving gentle pressure.
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Due to its extreme simplicity, the method was commonplace until the late 1960s, when it was surpassed by the popularity of the
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Other products not specifically intended for copying, but employing a similar PMT technology include: Kodak
Ektaflex (1981);
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88:(not infrared) for about 15 seconds, where shorter exposure darkens the copy, and longer exposure lightens it.
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sensitized "negative matrix" paper, then placed with the matte side of the matrix paper against the glass.
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for 30 seconds, then extracted by pulling it out through pressure rollers, finishing the negative.
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The original sheet to be copied is placed face-down against the shiny side of a sheet of
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using plain paper. Copies had some chemical smell and lost contrast over time.
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The DT (Diffusion transfer) was widespread in several countries since 1960:
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The original sheet is removed, and the matrix paper is immersed into the
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68:, sepia (1948), id, White Black (1950), id, color (1963)...
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negative. Has a base that contains the recipient with the
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231:True Genius: The Life and Science of JohnBardeen
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16:Patented photo copying approach by Kodak
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234:. Joseph Henry Press. pp. 242 –.
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228:Lillian Hoddeson (11 November 2002).
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194:Bonnier Corporation (January 1965).
153:The Focal Encyclopedia ofPhotography
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150:Michael R. Peres (20 June 2014).
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156:. Routledge. pp. 11 –.
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200:The Popular Science Monthly
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54:Gevacopy of Gevaert (1950);
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84:The papers are exposed to
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57:Verifax Kodak (1952-1976);
180:cool.conservation us.org
202:. Bonnier Corporation:
266:Photographic processes
93:developing solution
60:Copyproof (1980?);
43:Diffusion transfer
241:978-0-309-50064-7
196:"Popular Science"
163:978-1-136-10614-9
28:and the exposure
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117:Photo mask
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212:0161-7370
127:Photolith
261:Printing
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72:Process
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