Permanent ink is a type of ink designed to resist fading, water, and smudging once it dries. It is commonly used in various applications, including writing, drawing, and printing. The formulation typically includes pigments or dyes that bond well to surfaces, making it ideal for long-lasting results. This ink is often found in markers, pens, and printers, and is popular for labeling and crafting. Unlike temporary inks, which can be easily erased or washed away, permanent ink is intended for projects that require durability and longevity, such as artwork or important documents.