Sakura “Pigma” Pigmented Ink
Sakura Colour Products of Japan invented and patented Pigma ink over 25 years ago. It is a formulation of pigment based inks which are, more complex and stable than dye based inks, Pigma ink is a reliable, permanent, waterproof, fade resistant, archival quality ink. It is also quick drying and will not smear, feather or bleed through on most papers.
The Original Pigma Micron
The Pigma Micron Pen is the first fine-point writing instrument offering a water-proof, quick drying, black pigment ink. They are ideal for technical drawing, graphics, drafting and fine line illustration. Unlike dye-based ink found in most pens and markers, Pigma pigment ink is of archival quality, waterproof, fadeproof and smudgeproof on porous surfaces when dry. It does not feather and will not bleed through paper. Excellent copy machine reproduction.
Available in 8 line widths in Black plus 8 colours.
Here is a good description of the differences between Pigma Micron, Pigma Brush marker and Pigma Graphic