Platinum Classic Ink Blacks Fountain Pen Ink 60 ml
Class Ink is a water-soluble ink made by blending ingredients derived from plants, such as tea leaves, with iron. It penetrates the paper and solidifies due to oxidation; therefore, it is suitable for preserving documents for an extended period of time as it is highly resistant to light and water. Due to the oxidation process, the ink color blackens with time. The change is color is an intentional characteristic of the inks.