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The finest British-made fountain pen ink suitable for all pens. Named for the deepest point of the ocean (the Mariana Trench) this deep blue ink reflects the ocean’s mystical depths.
Transform the way you create with an ink colour that set...
Reviews
5.0
83 ratings
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Love the ink from Tom's Studio - brilliant rangevof colours
M
Matt · May 7, 2026
Terrific ink
The Marianas ink is a beautiful deep blue that works for virtually everything I write.
S
Scott · December 17, 2025
I love everything from Tom’s studio.This ink writes beautifully and is such a lovely colour