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Van Dieman’s Professional Natura Dualis – Underflow Dual Tone Fountain Pen Ink captures the subtle power of natures hidden currents. This ink features dynamic dual and multi-shading effects, halos, color splits, and rivering that evoke the steady, deliberate movement beneath the surface. Inspired by the quiet strength of tides, Underflow offers a cool, flowing experience on paper that invites close observation and appreciation of its evolving character. Ideal for those seeking an ink that balances visual complexity with refined control.
| Brand | Van Dieman’s |
| Ink Name | Underflow |
| Country of Origin | Australia |
| Color | Sea Glass Blue |
| Flow | |
| Shading | Yes |
| Sheen | No |
| Shimmer | No |
| Limited Edition | No |
| Water Resistance | Low |
| Iron Gall | No |