sumi ink is a traditional Japanese ink made from soot and animal glue. It is commonly used in calligraphy and ink painting, known for its rich black color and smooth application. Sumi ink can be found in various forms, including solid ink sticks that are ground on an ink stone with water to create liquid ink. This ink has a long history, dating back to ancient China, and is valued for its permanence and depth. Artists appreciate its versatility, as it can be diluted to create different shades of gray. Sumi ink is essential for creating expressive and dynamic brush strokes in East Asian art.