Tom's Studio - Fountain Pen Ink - Cosmic (Nyx)

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Order 2 Tom's Studio Fountain Pen Inks and get a 3rd Half Price - View the collection

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! 



  • For use in Fountain Pens, The Lumos and all dip pens.

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

  • Each bottle holds 50ml of this lovely ink, enough to keep you going for reams of writing, drawing or doodling. 

  •  All of our inks are water-based, acid-free, non-toxic, and are vegan-friendly.
  • Each Ink comes beautifully presented in a stunning bottle and antique laid paper, gold-foiled label.
  • Standard Shipping Costs:

    UK: £4.95

    EU: Our shipping costs vary by country and are calculated at checkout.

    USA: from $10.50 (charged in local currency)

    Rest of the world:

    We Ship Internationally. We take care of VAT and customs duty for EU customers. Your order will be shipped within 48 hours when in stock, please refer to lead times of the product you are buying, as some handmade / hand dipped products may take longer until we send them. Delivery is calculated from dispatch. All UK orders are shipped using Royal Mail Tracked 48. If you need your order by a specific date there is a next-day Special Delivery option.


    If your order contains a pre-order item, your whole order will be shipped together in order to minimise our carbon footprint. So please refer to pre-order delivery times in this instance. Alternatively, you can ask us to split the order. In this case additional delivery costs will apply. Please contact for further information.

    What is...

    Inky Goodness?

    It's a phenomena that the ink lovers among us will know all too well. Inky Goodness is the experience of opening a new bottle and putting down the first strokes on paper. There's that 'Ooo' moment when you start to see the ink dry and different shades and hues of the ink reveal themselves. Then there's the satisfaction of having a colour and pen combination that nobody else has. There really are no boundaries with ink, you can write, illustrate, design, make a mess :) but undeniably Inky Goodness is all about the joy of creating whatever you want to.

    Our Fountain pen inks can be used in Fountain Pens, The Lumos and all dip pens.

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    Customer Reviews

    Based on 10 reviews
    Terrific Ink

    Smooth, and every other quality an ink should have.

    Natalie R.
    Stunning colour and great names

    Amazing colour, and writes really well too! All the colours are brilliant not just this one, I have one for any colour I need to write in!

    Will T.
    Perfect green ink

    I love to write in green ink. I’ve recently bought the Lumos white and this works perfectly with it. The ink itself is smooth and the website was spot on about the'Ooo' moment when you see the ink dry and different shades and hues appear.

    Russ S.
    What a fantastic colour

    I love the colour of this fantastic ink…. And it writes beautifully using my Lumos


    Nice saturation of color, dries quickly, and is very smooth in use.