Tom's Studio Cassis Fountain Pen Ink – featuring the packaging, bottle and a swatch on paper

Fountain Pen Ink - 05 Cassis

A beautiful deep shade of red ink inspired by delicious blackcurrant liqueur.

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The finest British-made fountain pen ink suitable for all pens. While it won’t taste as good as blackcurrant liqueur (and we certainly wouldn't recommend having a sip), hopefully this beautiful shade of deep red looks just as delicious as the real thing.

Transform the way you create with an ink colour that sets you apart!

Most pens offer ink cartridges in a limited selection of colours. I want to change that by bringing you this range of beautifully rich and distinctive inks – with no need to dispose of or replace an empty cartridge.

These wonderfully free-flowing inks come in a number of beautiful and nuanced shades. They truly are a joy to write or create with!

  • Each bottle holds 50ml of ink, enough to keep you going for reams of writing, drawing, or doodling.
  • All of our fountain pen inks are water-based, acid-free, non-toxic and vegan.

Our fountain pen ink is compatible with all Tom’s Studio Pens, including calligraphy (The Flourish, Carrot, and Bloom), fountain (The Studio and Studio Pocket), and fineliner (The Lumos and Lumos Mini).


Fountain pen inks are highly 'layerable', allowing you to build different intensities or colours by applying more or less ink on the paper. Please note that the colour on the label may not perfectly represent the colour achieved when using different pens or techniques.


Because the ink has such a concentrated colour, you can dilute it with a smidge of water (ideally distilled) to create watercolour-like washes and depth of colour.

Shipping costs are calculated at checkout.

For dispatch times, customs details, and more, please visit our Delivery page. Got a question? Just reach out via our Contact form – we’re here to help!

Buy 3 Fountain Pen Inks – Get the 3rd Half Price

 
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Fountain Pen Ink - 01 Deep Black

Classical doesn’t have to mean boring, the very deepest of blacks.

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Tom's Studio Mallard Fountain Pen Ink – featuring the packaging, bottle and a swatch on paper

Fountain Pen Ink - 07 Mallard

A deep blue-green, like the plumes of a mallard duck

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Tom's Studio Marianas Fountain Pen Ink – featuring the packaging, bottle and a swatch on paper

Fountain Pen Ink - 14 Marianas

This deep blue ink reflects the ocean’s mystical depths.

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Tom's Studio Juniper Fountain Pen Ink – featuring the packaging, bottle and a swatch on paper

Fountain Pen Ink - 12 Juniper

What better inspiration than the Juniper plant, with its delicious bounty of deep purple berries.

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Customer Reviews

Based on 271 reviews
93%
(253)
3%
(8)
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(8)
1%
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S
Sharon C.
Classy!

A beautiful bluey, greeny grey. Sober enough for business use but just that little bit different. Flows beautifully from my Wren pen and even the bottle looks lovely on my shelf.

A
Alexandra

Beautiful colour!

E
Excellent b.i.
Perfect black ink

This black is perfect. Black and smear-free for excellent writing.

J
James A.
As good as advertised

Bought this for my granddaughters birthday ( at her request) . She loves her drawing & artistry so really wanted this . She loves it

D
Diane N.
Loch Ness

I recently purchased the Lumos Pro single and bought the Loch Ness ink too. As a tour guide, who lives near Loch Ness and provides tours through this beautiful country, part of what I do is to gift each client with a piece of parchment paper, each with a calligraphy hand-written note from my husband and me (but dated 1745), which is then sealed with a real wax seal. I bought the Lumos to make this so much simpler for me to do than using my fountain pen (purchased elsewhere some years ago), and it has halved the time it takes me to write the notes. I love that the ink is called Loch Ness, because it is my favourite colour on earth, we always take our clients there, and I can tell them it's called Loch Ness when I hand them their wax sealed note from the Scottish Highlands.

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