Visible Penetrants convenient and well suited to surface flaw detection for applications including: welding inspection, and maintainance inspection when higher sensitivity is not specified. Visible Penetrants are considered low sensitivity (Level 1/2 and 1).
Note: Penetrant must enter a defect by the capillary attraction process. This means that the surface and flaw must be clean, open and free of contaminants that will prevent the penetrant from entering a flaw.