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

Fountain Pen Ink - 09 Constellation

This beautifully purple-toned ink is a clear night sky in liquid form.

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The finest British-made fountain pen ink suitable for all pens. Goddess of the night, Nyx is known to dwell in her mansion at the very boundary of the cosmos. Named for her and her cosmic home, this beautifully purple-toned ink is a clear night sky in liquid form.

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

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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

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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 251 reviews
94%
(235)
3%
(8)
2%
(6)
1%
(2)
0%
(0)
A
Anabel

Beautiful dark blue ink! Flows very well. Dries fast

A
Anthony E.
Wonderful!

It has become my pen of choice!

A
Anne M.
A very happy friend

Bought these for a friend of mine who owns a Lumo since a while and she was really happy with my extra inks and tips..,

M
Marietta

I really like this color, it reminds me of the sea.

M
Marietta

I think this ink is an absolute treat, this is my regular and I feel that I love it.

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