Uni Pin Fine Line Drawing Pen, 0.5 mm, Archival Pigment, Water-Resistant, Low-Bleed, Ideal for Diagrams & Tonal Notes - Light Grey

Tip size: 0.5 mm. Ink: archival pigment that’s water-resistant and fade-resistant. Color: light grey. Features include low bleed and a textured barrel to help steady strokes during long lines.

Ideal for standard drawing paper, sketchbooks, layout pads, and other non-glossy papers. It’s great for diagrams, margins, and tonal notes where you want readable, non-intrusive lines.

Use the light grey 0.5 mm when you want tonal depth without overpowering other elements on the page. Black ink provides stronger contrast for main outlines, while grey is ideal for subtle markings, annotations, and shading.

Hold the pen at a steady, comfortable angle and draw along the edge of your ruler or template. Use short, controlled strokes rather than long continuous lines, and let each mark dry briefly before layering. Cap the pen when not in use to prevent drying.

Choose appropriate paper quality, apply light, consistent pressure, and allow ink to dry before turning pages or adding layers. Using a light grey ink like this helps reduce visible feathering compared to lighter papers when used with thin lines.

Yes. The pigment ink is archival-grade and designed for long-term readability. It is water-resistant and formulated to minimize bleed and feathering, making it suitable for diagrams and tonal notes.

Cap the pen when not in use, store it in a cool, dry place away from direct sunlight, and keep it upright or horizontally with the cap on to prevent ink from drying. Avoid exposing the pen to extreme temperatures or moisture.

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Its combination of a precise 0.5 mm line, archival pigment ink, water resistance, and low-bleed performance in a light grey shade provides tonal flexibility for diagrams and subtle annotations without overpowering the page, making it a smart choice for precise, long-lasting work.

Use it for light, precise lines such as margins, grids, and tonal guidelines. Pair it with bolder black inks for main outlines, then add shading or annotations with the light grey to keep the diagram legible and balanced. Dry times are quick, so you can layer subtly without smudging.