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Lightfastness

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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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