Writing ink is a liquid used for writing or printing, typically made from a mixture of water, dyes or pigments, and other additives. It comes in various colors and formulations, including permanent, washable, and erasable types. Writing ink is commonly found in pens, markers, and fountain pens, allowing for smooth and consistent application on paper. The history of writing ink dates back to ancient civilizations, where natural materials like soot and plant extracts were used. Today, modern writing inks are often produced using synthetic dyes and advanced technology, ensuring better performance and longevity. Popular brands include Parker, Pilot, and Montblanc.