| 摘要 |
PROBLEM TO BE SOLVED: To provide an optical reading medium which makes it hard to forge information such as an identification code even by using a general copying machine, can be produced by a normal printer, and/or can read information without requiring a light source of near-infrared ray.SOLUTION: An optical reading medium has optical read information formed from a first part and a second part. At least either the first part or the second part is a part with juxtaposed and mixed colors, where a single color or a combination of multiple colors forming the first part differs from a single color or a combination of multiple colors forming the second part. A value of color difference ΔEab between the first part and the second part in a Labcolor system following JIS Z 8781 is 3.0 or smaller.SELECTED DRAWING: Figure 1 |
