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:
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.
- Clive Harper