Liquid Penetrant Methods are non-destructive testing techniques used to detect surface-breaking defects in materials. This method involves applying a liquid penetrant to the surface of the material, allowing it to seep into any cracks or voids. After a specified dwell time, the excess penetrant is removed, and a developer is applied to draw out the penetrant from the defects, making them visible. These methods are widely used in various industries, including aerospace, automotive, and manufacturing. They are effective for detecting flaws such as cracks, porosity, and laps in metals and non-metals. Liquid penetrant testing is valued for its simplicity, cost-effectiveness, and ability to provide immediate results.