FADEOMETER AND SUNLIGHT EQUIVALENTS IN DAYS FOR
VARIOUS MONTHS OF THE YEAR FOR PRINTING INKS
|
Fadeometer
Exposure Hours |
Jun / Jul / Aug |
Sept / Apr / May |
Oct / Nov / Mar |
Dec / Jan / Feb |
|
1 |
0.42 |
1.26 |
2.5 |
7.5 |
|
2.33 |
1.0 |
3.0 |
6.0 |
18.0 |
|
6 |
2.5 |
7.5 |
15.0 |
45.0 |
|
12 |
5.0 |
15.0 |
30.0 |
90.0 |
|
24 |
10.0 |
30.0 |
60.0 |
180.0 |
|
48 |
20.0 |
60.0 |
120.0 |
360.0 |
|
96 |
40.0 |
120.0 |
240.0 |
720.0 |
|
144 |
60.0 |
180.0 |
360.0 |
1080.0 |
YEAR ROUND AVERAGE: 1 HOUR = 3 DAYS
Based on date determined by the United States Bureau of Standards at Washington.
Six sunlight hours ( 9 A.M. to 3 P.M. ) is considered one day.
Inks made with fade-resistant pigments will generally last up to three months with exposure to sunlight. |
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