Fountain Pen Ink Diplomat Diplo Octopus 30 ml — dark blue

Diplomat Diplo Octopus fountain pen ink comes in a 30 ml glass bottle and offers a classic dark blue color formulated for use with fountain pens. The ink provides consistent flow and good color saturation while remaining compatible with most fountain pen nibs and feed systems. Packaged in a compact bottle designed for stable storage and controlled pouring, this dark blue ink is suitable for everyday writing, formal correspondence and journaling where a traditional deep-blue tone is preferred.

Advantages

Diplomat Diplo Octopus dark blue fountain pen ink is developed to balance flow and saturation while minimising clogging and excessive feathering on common writing papers. The 30 ml glass bottle ensures safe storage and easy handling when refilling converters or demonstrator pens. Colour stability and reliable wetting properties make this ink convenient for regular use without requiring special maintenance routines beyond normal nib care.

Suitable for

• Daily handwriting and note taking with fountain pens
• Personal or professional correspondence requiring a classic dark blue tone
• Journaling and sketching where waterproofing is not a primary requirement
• Refilling converters, piston fillers and ink reservoirs in compatible fountain pens

Key specifications

• Volume: 30 ml
• Color: Dark blue
• Container: Glass bottle designed for ink dispensing
• Formulation: Water-based fountain pen ink suitable for most nibs and feeds
• Performance: Balanced flow with good saturation and reduced clogging risk

How to use

Before refilling, wipe the pen nib and feed to remove residual ink and ensure a clean fill. Open the glass bottle and fill the pen according to the manufacturer’s instructions for your converter or filling mechanism. Avoid overfilling; secure the cap on the bottle after use to limit evaporation and contamination. After filling, prime the feed by gently turning the converter or operating the filling mechanism until ink reaches the nib. Clean any spilled ink promptly from surfaces and hands using water and a soft cloth.

Usage recommendations

Store the bottle upright in a cool, dry place away from direct sunlight. Use with well-maintained fountain pens and perform routine cleaning of the nib and feed to prevent buildup. If unused for long periods, perform a flush with clean water before refilling to maintain optimal performance.