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iroshizuku Fountain Pen Ink Cartridges

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Top 12 colours offered in convenient ink cartridges

High-quality, well-behaved water-based ink, inspired by natural Japanese landscapes

Suitable for PILOT and Namiki Cartridge-Converter Fountain Pens

Also available in 50ml Glass Bottles and 15ml Box Sets

Ink Colour

Choose a colour


Bring the quiet beauty of the Japanese landscape to your creative practice with PILOT iroshizuku Fountain Pen Ink. Each colour is a unique offering that reflects the changing natural landscape of Japan through each season - distilling beautiful moments into a bottle, such as the colour of the deep sea when illuminated by the moon or the interesting texture of a stone pavement that is wet with drizzle.

The Top 12 colours of iroshizuku are now available in convenient, proprietary cartridges suitable for PILOT and Namiki fountain pens with cartridge/converter filling mechanisms. Perfect for calligraphy and drawing, this ink makes it easy to express yourself on paper with its range of 24 complex and vivid colours.

Each set of 6 cartridges is presented in elegant premium packaging, adding to the known pleasure that comes with the Art of Writing.

All 24 colours are available in 50ml glass bottles and key colours are also available in Box Sets of 3 x 15ml Mini Bottles.

Explore all 24 Colours. Inspired by Nature.

Exquisite moments captured in every bottle: like the moonlit hue of the deep sea or the ever-changing texture of a stone-paved path after a storm.

Frequently Asked Questions

PILOT Signature Cartridge (IC-50) & Rotary Ink Converter (CON-40) Only:
Desk Fountain Pen, MR Range, Prera, Cavalier, E95s, Capless

PILOT Signature Cartridge (IC-50), Rotary Ink Converter (CON-40) & Push Button Ink Converter (CON-70):
Kakuno, Explorer, Falcon, Justus 95, CUSTOM 74, CUSTOM 742, CUSTOM 743, CUSTOM 845, CUSTOM Heritage 912, CUSTOM Heritage SE, CUSTOM Urushi, Namiki

Cartridge-Converter: A cartridge-converter fountain pen can use either ink cartridges or an ink converter. The converter is a removable and refillable unit that replaces the cartridge. It allows users to draw ink from a bottle, providing more ink options than cartridges alone.

Vacuum Filler: A vacuum filler fountain pen utilises a vacuum mechanism to draw ink into the pen's reservoir directly from an ink bottle. By compressing and releasing a mechanism on the pen, the vacuum is created, pulling ink into the pen. It offers a larger ink capacity than cartridge-converter pens and is relatively easy to refill.

Piston Filler: A piston filler fountain pen employs a piston mechanism built into the pen's barrel. By twisting the end cap, the piston moves, creating a vacuum that draws ink into the pen from an ink bottle. This mechanism also provides a higher ink capacity compared to cartridge-converter pens and allows for easy refilling without the need for a converter or cartridges.

A combination of the Japanese words: ‘iro’ 色 meaning colour and ‘shizuku’ 雫, translating to dew or droplet.
PILOT iroshizuku reflects our mission to distill the unique beauty of the Japanese landscape into every colour droplet found in each bottle of fountain pen ink.

No - most fountain pen inks are water-based/water-soluble and the rich, vivid colours available within the PILOT iroshizuku range could not be achieved with a waterproof formula.

The advantages of water-soluble inks are that they are more well-behaved and require less maintenance when used in fountain pens. With the pigments or iron gall particles that are used in waterproof inks, there is a risk of clogging or damaging your fountain pen, especially if left in it for a long period of time.

Another enjoyable aspect of using water-soluble inks, especially when sketching and painting, is the ability ‘pull colour’ from the ink like you would with watercolour paints. Further dimension can be added to a sketch when using a wet paintbrush.

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