"Stained" is a term often used to describe something that has been marked or discolored, typically by a substance that leaves a lasting impression. This can apply to various materials, such as fabric, wood, or glass, and can result from spills, dirt, or other contaminants. Stains can be challenging to remove and may require specific cleaning methods or products. In the context of art, "stained" can refer to a technique where color is applied to a surface in a way that allows the underlying material to show through. This method is commonly used in watercolor painting and stained glass art, where the transparency and layering of colors create unique visual effects.