Van Dieman's - Natura Dualis Underflow Dual Tone Fountain Pen Ink Underwater Tortoiseshell

Tortoiseshell

They have brilliant green wings that can be seen throughout Tasmania's wilderness from their first metamorphosis in August

Night Collection – 2026 Edition

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Bestow a few droplets to your masterpiece or infuse in any standard fountain pen ink

Van Dieman's - Natura Dualis Underflow Dual Tone Fountain Pen Ink Underwater TortoiseshellUnderflow Natura Dualis Collection The Natura Dualis collection by Van Diemans brings together moments in nature where contrast and harmony coexist. Each ink is formulated not only for visual beauty, but for movement dual and multi shading behaviour, halos, colour splits, and rivering that reflect the changing character of the natural world. Like dawn breaking over land, or water surging beneath stillness, these inks never show just one face.