Sumi is a traditional Japanese ink made from soot and animal glue. It is commonly used in calligraphy and ink wash painting, known for its rich black color and smooth application. Sumi can be found in various forms, including solid ink sticks that are ground on a stone surface with water to create liquid ink. The use of Sumi dates back centuries and is an essential part of East Asian art culture. Artists appreciate its versatility, as it can produce a range of tones from deep black to light gray. Sumi is also valued for its ability to create expressive brush strokes and intricate details.