👉 A marking fluid, often used in educational settings, is a transparent, water-soluble liquid ink designed to highlight written work on paper. It's typically composed of pigments suspended in water, allowing it to flow smoothly and adhere evenly to the paper surface. Teachers or students can easily erase it with a damp cloth, making it an ideal tool for providing feedback without leaving permanent marks. This fluid is particularly useful in highlighting specific sections, correcting errors, or emphasizing key points, enhancing the learning process by making written content more visible and interactive.