PLATINUM - 60ml Fountain Pen Ink - Chou kuro (The blackest black in Platinum Pen’s history)

Instructions

When cleaning the pen nib after using Chou Kuro ink, use purified water available at pharmacies, etc. Avoid washing it with tap water as it reacts with minerals contained in the water and makes it difficult to remove the stains.

「Chou Kuro」special page