Magnetic particle testing is a non-destructive testing method used to detect surface and near-surface flaws in ferromagnetic materials. The process involves magnetizing the object and applying fine magnetic particles, which can be in dry or liquid form. If there are any cracks or defects, the particles will gather at these areas, making them visible under ultraviolet light or white light. This technique is widely used in various industries, including aerospace, automotive, and manufacturing, to ensure the integrity of components. It is effective for identifying issues like cracks, seams, and inclusions, helping to maintain safety and quality standards.