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Dye Penetrant Inspection (DPI) is a non-destructive testing (NDT) method used to detect surface-breaking defects, such as cracks, porosity, and voids, in non-porous materials.

It involves applying a liquid penetrant, usually red or fluorescent, to the surface of a component. The low surface tension of the penetrant allows it to seep into surface-breaking defects like cracks or pores. After allowing it to dwell, excess penetrant is removed, and a developer is applied to draw the penetrant out, revealing visible indications of the defects for easy inspection.