Description Platinum Chou Kuro fountain pen ink is the blackest ink ever created from Platinum in its 104-year history and comes in a 60ml glass bottle with a built-in reservoir for easy filling of your fountain pen. Platinum Chou Kuro ink is blacker than black, and 46.8% darker than Platinum's famous Carbon Black, making this new permanent ink from Platinum the color to set the new standard of what is possible from permanent black ink in the fountain pen market. Platinum ink is made in Japan and is very popular for its consistent performance. We offer Free Shipping on all orders over $59 for US customers!