Platinum Carbon Black Fountain Pen Ink Sample (3mL)Platinum Fountain Pen Best Black Ink in History Over 100 Years The clear, dark ink is highly visible but not easy to bleed, and it is highly water resistant, making it ideal for items that need to be stored for a long time. When cleaning fountain pens using super black, please use commercially available purified water sold by pharmacies. Due to the nature of the product, tap water reacts with the minerals contained in tap water to prevent ink stains.