Have the Pigma® pens been tested for lightfastness?
Sakura tests the performance of their products BEFORE making any standards or performance claims. When testing lightfastness, Sakura uses large light chambers to accelerate the aging/ exposure of Pigma ink writing test samples as on a typical bright summer’s day. From our tests results we estimate that our Pigma inks will not have any noticeable ink hue change for up to 100 years. Beyond this many years, the papers they are tested on become a problem and there is a question of whether the paper color is changing or the ink color is changing. Accelerated light tests such as theses are the only practical way of estimating light-fastness results. Pigma® ink is the highest quality, archival ink that Sakura manufactures. You may want to find out if other manufacturers actually test their inks, or just make marketing claims of lightfastness. Besides light exposure, inks can also be effected by other environmental exposures such as humidity, temperature, and airborne chemicals, and liquids. E
