Patent Number: 7,784,367

Title: Method of gas resistance test for image and ink set

Abstract: Gas resistance of an image is evaluated by placing the image in a mixed gas atmosphere containing at least ozone and nitrogen dioxide. The mixed gas atmosphere is controlled such that the concentrations of ozone and nitrogen dioxide are not less than 75 ppb and not less than 150 ppb, respectively, and the mixed gas is continuously supplied to the surface of a sample bearing the image at a flow rate not less than 0.2 m/s and not more than 3.0 m/s.

Inventors: Kojima; Yojiro (Tokyo, JP), Ogino; Hiroyuki (Yokohama, JP), Ishikawa; Takayuki (Inba-gun, JP), Yamamoto; Takao (Yokohama, JP)

Assignee: Canon Kabushiki Kaisha

International Classification: G01N 17/00 (20060101)

Expiration Date: 8/31/12018