Pigma ink, invented by Sakura over 25 years ago, continues to be the most reliable permanent ink on the market today. Artists, consumers, the government, and scientists consider Pigma Micron a necessary basic tool for any archival-quality, handwritten project.This permanent, fade resistant, chemically stable, pigment-based ink will not bleed or run if liquids are spilled on or applied to the document after the ink has dried.