| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a method for surely and quickly judging the quality of light resistance of a printed matter printed by a recording method using an ink composition, for example, an ink jet recording method. SOLUTION: Desired light resistance acceleration test is performed on a printed matter, coordinates of L*a*b* color specifications systems of a color difference display method regulated by CIE of a black image part being in a range of 0.5 to 1.5 in a reflection OD value in the printed matter before an acceleration test are respectively determined before and after the acceleration test, and the printed matter being not more than 6 in a color differenceΔE*ab expressed by the following expression is judged as allowable on light resistance. The color differenceΔE*ab=[(ΔL*)2+(Δa*)2+(Δb*)2]1/2 (in the expression,ΔL*,Δa* andΔb* mean respective differences between coordinates of L*, a* and b* of L*a*b* color specification systems before the test and after the test.</p> |
