| Sunburst Symbol | PanPastel Asterisks | ASTM Rating | ASTM Rating Definition* |
|---|---|---|---|
 |
|
I EXCELLENT | At least 100 years lightfast under museum conditions |
 |
|
II VERY GOOD | 25 - 100 years lightfast under museum conditions |
 |
|
III FAIR | 10 - 25 years lightfast under museum conditions |
* There is no official ASTM lightfastness standard for pastels, therefore we apply the standard for Colored Pencils which is the closest standard available.