Pigma Micron pens offer a waterproof, quick-drying pigment ink in a fine point writing instrument. The ink dries to a fade-resistant and smudge-proof quality on porous surfaces including 100% cotton fabrics. Linework does not smear or feather, and it will not bleed through most papers. Use this archival pen for graphics, journaling, scrapbooks, memos, illustration, drafting, record keeping, cartooning, accounting, and any project that requires lasting results. The ink is pH neutral, chemical resistant, and ideal for acid-free environments.