Fountain Pen Ink - 13 Mulberry

A striking ink choice for your creative ventures.

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The finest British-made fountain pen ink suitable for all pens

Symbolically dedicated by the Ancient Greeks to their Goddess of wisdom, Athena, the Mulberry tree is our chosen source of inspiration for our deepest, richest shade of red – a striking ink choice for your creative ventures.

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.

We aim to process your order within 1-3 working days. Please note that this increases to 1-4 working days for orders that include any personalisation, such as engraving.

Shipping costs
Shipping costs are calculated at checkout.

Delivery times

  • UK: 1-2 business days
  • Europe: 3-5 business days
  • USA: 5-7 business days
  • Rest of world: 8-10 business days (duties may apply on delivery)

Please refer to our Delivery page for more information, and reach out to us at hello@tomsstudio.co.uk if you have any further questions.

Customer Reviews

Based on 113 reviews
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Lorraine D.
Inky ink

Loving the ‘deep black’ fountain pen ink. Its smooth and black!! The packaging is great and i love the bottle - the shape is perfect for dipping in the ink straws and also for nib dipping.

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Kelsey

The ink is very opaque and has that true deep black I was looking for. Paired with the Tom’s Studio refillable pen is just such a delight to illustrate with.

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Kelsey

The ink is gorgeous. Paired with the Tom’s Studio refillable pen is just such a delight to illustrate with.

K
Kelsey

The ink is gorgeous. Paired with the Tom’s Studio refillable pen is just such a delight to illustrate with.

K
Kelsey

The ink is gorgeous. Paired with the Tom’s Studio refillable pen is just such a delight to illustrate with.