Van Dieman's Feline - Mad Half Hour - 40ml Shimmering Fountain Pen Ink

Mad Half Hour

Feline Collection – 2026 Edition

New 40ml Bottle

Every cat owner knows it.

That sudden burst of inexplicable energy. The sprint down the hallway. The sideways leap. The full-tilt chaos that lasts exactly thirty minutes before complete serenity returns.

Mad Half Hour was created to capture that moment.

On the page, it lays down a deep grape purple, saturated and indulgent. Rich like crushed berries, with enough density to hold its shape in finer nibs and deepen dramatically in broader ones.

But the real mischief lies in the shimmer.

Suspended throughout the ink is a dynamic multi-colour shimmer that flashes between blue and violet as the angle shifts. It moves with the light. It flickers unexpectedly. It refuses to sit quietly. The effect is playful without being garish, energetic without losing composure.

For 2026, Mad Half Hour retains its exact colour and shimmer profile, now delivered through our refined production process:

• Zero sedimentation
• Smoother, clearer flow
• Larger batch production for greater consistency between bottles

The shimmer disperses more evenly and remains suspended longer, giving a cleaner writing experience with less agitation required.

Suitable for fountain pens, dip pens and brushwork. As with all shimmer inks, a broader nib and generous flow will showcase the full colour shift and depth.

Mad Half Hour is chaos in a bottle.
But beautifully controlled chaos.