An "Ink Stain" refers to a mark or discoloration caused by ink that has spilled or been applied to a surface, such as paper or fabric. These stains can vary in size and intensity, depending on the amount of ink and the type of material affected. Common sources of ink stains include pens, printers, and ink bottles. Removing ink stains can be challenging, as the ink can penetrate fibers and become set over time. Various methods exist for stain removal, including using solvents like rubbing alcohol or vinegar, and commercial stain removers specifically designed for ink.