| 摘要 |
PURPOSE: Provided is a blue print produced by using photosensitive paper coated with a film, which is strong against water and moisture, thereby it dose not be decolorized and torn. CONSTITUTION: The blue print is produced by vaporization-spraying a developer onto the white back side of the photosensitive paper coated with the film and developing blue images with the permeated developer in a developing part of a blue print apparatus. The photosensitive paper is coated with iron salts on one side thereof, and the film is attached to the iron salts coated side, wherein the film is oriented polypropylene film.
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