Permanence – Pigma inks are also permanent, waterproof, chemical resistant and temperature-resistant on paper and on many fabrics.Neutral pH refers to a material with a pH of 7, that is, one that is neither acid nor alkaline. Neutral pH – Pigma inks dry to a neutral pH and, therefore, will not adversely effect the materials on which they are applied. Lightfastness refers to the ability to retain color over time and/or when exposed to light, heat, or other adverse conditions. Lightfast – Pigma® inks are light fast due to the high quality pigments that compose them.Sakura uses one or two pigments to color its inks, to enhance their chemical stability, and to eliminate the possibility of pigment separation due to age or exposure to outside elements. Our Pigma ink is also chemically stable, which refers to the ability to resist chemical degradation.
The formula for Pigma ink was developed specifically for museum archivists and conservators after extensive research and testing. Pigma® is the brand name of the pigmented ink used in Sakura products.While archival is a non-technical term, as there are no industry standards for how long archival materials must last, Sakura uses archival to describe the high overall quality of our Pigma® ink products. They can be safely used for pieces such as legal documents, family albums or journals. Archival suggest that these products are permanent, durable and chemically stable. You may have noticed that many Sakura products including Pigma products and some Gelly Roll pens are labeled Archival.
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