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

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

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 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 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 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 314 reviews
91%
(287)
4%
(13)
3%
(9)
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(1)
T
Tracy B.
Love the colour

I’m not a fan of black ink so purchase this for my wren pen, love the colour and in all honesty the wren pen is such a lovely pen to use with this ink. Love it

D
Dominic S.
Trench Life

I love seeing the darkest blue as it flows from the nib of my pen to form the lines, swirls and curls of the letters making up the words in my daily journal. Juxtaposed next to text in Cassis the words come alive both visually and in meaning.

M
Michelle

Gorgeous colour ink!

A
A.B.

Love this colour ink - thank you

H
H.G.

Lovely ink

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