"Features Chemically stable, waterproof, and fade resistant. No smears /feathers, or bleed-through on most papers Ideal for use in acid-free environments . Meets ACMI non-toxicity standards. Application Multi-purpose pen with the unique, long lasting archival Pigma ink. Use for tamper proof signatures Ideal for precision and permanence over generations Popular with artists, writers, and illustrators to convey their personality, style, or ability, and to safeguard their work with the lasting quality of Pigma ink. Ideal for fine-point technical drafting, artistic applications and preservation. Used and recommended by anthropologists/entomologists, scientists/archivists/architects, and professional diamond cutters; cartoonists/Manga and Anime artists /illustrators /heirloom quilters and decorative fabric artists "