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.

Item is in stock Only 0 left in stock Item is out of stock Item is unavailable

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 this lovely ink, enough to keep you going for reams of writing, drawing, or doodling.
  • All our inks are water-based, acid-free, non-toxic, and vegan-friendly.
  • Each ink comes beautifully presented in a stunning bottle with an antique laid paper, gold-foiled label.

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. If you have any questions, feel free to reach out to us at hello@tomsstudio.co.uk – we’re here to help!

BUY 3 tom's studio fountain pen inks - save 20%

 
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.

€18,95
 
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

€18,95
 
Tom's Studio Marianas Fountain Pen Ink – featuring the packaging, bottle and a swatch on paper
Sold Out

Fountain Pen Ink - 14 Marianas

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

€18,95

Sold Out

 
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.

€18,95

Customer Reviews

Based on 203 reviews
94%
(190)
2%
(5)
3%
(6)
1%
(2)
0%
(0)
J
Jeff B.
Smooth and Beautiful Ink

This purple ink is gorgeous and royal!
To Tom’s Studio I’m increasingly loyal.

I have searched for the perfect purple, and this #11 is it. It’s my fourth bottle of Tom’s Studio (I also have #1, #76, and #78), and I can’t imagine using any other ink.

L
Liliana L.

I love this color! Very elegant and smooth.

M
Maria C.

Beautifully packaged. Quality ink.

M
Mary S.
Beautiful Ink Color

This Tom’s Studio blue ink, Marianas, is breathtakingly beautiful. This probably sounds silly but it calms my soul as I’m writing with it. Need I say more?

H
Hilary E.W.

Lovely inks and fast professional mail order service

Load More