Dye penetrant / Leak detectors are a general term for liquids used to detect flaws on metal surfaces and liquids used to detect gas and oil leaks. Dye penetrants are used to detect pin holes and cracks in castings and metal surface flaws. The inspection method involves completely removing the dirt on the inspection object with the cleaning liquid, then applying the penetrating liquid and wipe off the excess liquid. After that, when the developer is applied, the defects appear clearly. It is necessary to select a cleaning solution, a penetrating solution, and a developing solution according to the application, and also to select a non-gas type or aerosol type. Depending on the application, the leak detection agent is for gas, oil, water, or foam, and is used for various pipes, gas equipment, leak detection of aqueous liquids, etc. Detect by applying a liquid type or spray type.