Noodler's Ink lubricating Black Bottled Ink Refill

Polar Black -- Bulletproof -- Waterproof Safe for Vintage and New Fountain Pens EEL INK American-made eel inks contain added lubricants intended to keep piston-filled pens writing smoothly. With type of ink, the piston can maintain smooth sliding without becoming clogged. WATERPROOF - Bulletproof inks are resistant to water and tools of forgery such as bleach, alcohol, and UV light. These inks use cellulose-reactive dyes and work best on uncoated and cellulose-based papers. FOR FOUNTAIN PENS This ink is suitable for fountain pens, calligraphy, and piston-filled pens. For pens with skip-prone nibs, a permanent regimen of Eel Black can make them write consistently.