Lightfastness
Specification of lightfastness figures in accordance with the international standard C.E.I./02-59.
| Lightfastness value: | 8 = exceptional | 4 = fair |
| 7 = excellent | 3 = moderate | |
| 6 = very good | 2 = poor | |
| 5 = good | 1 = very poor |
In Western Europe, the above-mentioned values can be expressed in number of days as follows:
| value | June July August |
April May September |
March October November |
December January February |
|---|---|---|---|---|
| 1 | 1 | 3 | 6 | 18 |
| 2 | 2 | 6 | 12 | 37 |
| 3 | 4 | 12 | 25 | 75 |
| 4 | 8 | 25 | 50 | 150 |
| 5 | 18 | 50 | 100 | 300 |
| 6 | 35 | 100 | 200 | 600 |
| 7 | 71 | 201 | 400 | 1200 |
| 8 | 142 | 403 | 800 | 2400 |
One day = exposure to daylight from 9.00 to 15.00 hours.
WARNING: The above-mentioned figures are indicative. Results can be influenced by matters such as thickness of the ink-layer, ink and/or water additives used during printing, intensity of sunlight, environmental conditions, etc.
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