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May, 2009
PRECAUTIONS OF LIGHTFASTNESS CHART
INTRODUCTIONS
Lightfastness data of each ink series are listed in this literature. Please refer to the following precautions before use.
Criteira
| Grade | Estimation | Approx. exposure limit |
|---|---|---|
| 8th | Extremely Excellent | >2 years (2-3 years) |
| 7th | Excellent | <2 years(1-2 years) |
| 6th | Very Good | <1 year(6 months - 1 year) |
| 5th | Good | <6 months (4-6 months) |
| 4th | Average | <4 months (2-4 months) |
| 3rd | Inferior | <2 months (1-2 months) |
| 2nd | Poor | <1 month (2 weeks - 1 month) |
| X | Bad | <2 weeks (1- 2 weeks) |
- Lightfastness remarkably varies according to the thickness of ink film and under what conditions printed matters are used. The grade of lightfastness is obtained by the test in which we exposed the printed matter at the angle of 45 degrees to the south at our laboratory(Hanyu City, Saitama Pref. JAPAN). They are not guarantee grades.
- Exposure limit is shortened in the summer time or in the place where sunshine is strong.
- Data were gained from standard colors that are printed under ordinary conditions. The lightfastness of pale colors and the ink printed with finer meshes are inferior to the above mentioned grades. The performances of pale colors and matched colors are much inferior to the above data. (Please refer to "Lightfastness of color-matched ink" for the details.)
- The colors which are indicated in gray column are different in shades or way of numbering from the standard ones.
- All fluorescent colors are bad in lightfastness(x) and fade in a week.
- Generally speaking "lightfastness" means the estimation against light, while "weathering resistance" means that against weathering conditions. "Lightfastness" in this chart also means "weathering resistance".
- It is necessary to use over-coat varnish, lamination or printing on the back side of transparent material, when lightfastness over 3 years is required.
- (LF) means that the colors with this indication are lightfast version. Please refer to Lightfastness List for the lightfastness of each color. The indication, "LF", does not show on the label of the container.
- Please refer to Technical information for the usage, MSDS for precautions.
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