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The Diamine Midnight is a deep, rich blue that sits very close to navy, with a slight purple undertone that becomes more noticeable in heavier strokes. On the page, it looks darker than standard blue inks but not as flat as a blue-black, giving it a bit more character while still staying professional and readable.
Performance-wise, it follows the typical Diamine formula—water-based, non-toxic, and safe for all fountain pens, including vintage ones. The flow is smooth and slightly on the wetter side, which helps bring out the depth of the color and any subtle shading. On good paper, you may even notice a faint sheen in broader nibs, adding a bit of visual interest without being overwhelming.
The 30 ml version comes in Diamine’s standard slim plastic bottle, which is lightweight and practical for trying new inks or rotating colors. Like other 30 ml bottles, the opening is a bit narrow, so filling larger pens can take a little extra care—but in return, you get a compact, affordable way to experience one of Diamine’s more classic dark blue shades.
