Liquidraw Technical Pen Black Ink - 0.85 fl oz / 25 ml | Waterproof Drawing Ink | Refill Pot Compatible with Rotring Isograph Pens | Plastic Bottle & Screw-On Lid | Ideal for Drawing & Calligraphy

DEEP BLACK PIGMENT: Formulated with intense black pigment ink for rich, high-contrast lines; ideal for technical drawing, drafting, illustration, calligraphy & precise fine line sketching on paper, tracing sheets or layout work COMPATIBLE PEN: Designed for seamless use with Rotring Isograph pen or dip pens, this 0.85 fl oz / 25 ml bottle offers reliable ink flow; easily refill your pen without needing to replace it WATERPROOF & SMUDGE RESISTANT: This waterproof, bleed-resistant ink dries quickly & bonds to paper for clean, sharp results; suitable for archival artwork, architectural drafting, manga line art & detailed technical illustration FOR ARTISTS & STUDENTS: Ideal for architects, engineers, designers, illustrators & calligraphy practice; a reliable black drawing ink for studio, classroom, office or professional art supplies EASY STORAGE BOTTLE: Supplied in a sturdy plastic refill bottle with secure screw-on lid to keep ink fresh between uses; convenient, mess-controlled solution for regular technical pen refills