Dye penetrant inspection (DPI), also called liquid penetrant inspection (LPI) or penetrant testing (PT), is a widely applied and low-cost inspection method used to locate surface-breaking defects in all non-porous materials (metals, plastics, or ceramics). The penetrant may be applied to all non-ferrous materials and ferrous materials, although fo...
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http://en.wikipedia.org/wiki/Dye_penetrant_inspection
A method for detecting surface porosity or cracks in metal. The part to be inspected is cleaned and coated with a dye which penetrates any flawa that may be present. The surface is wiped clean and coated with a a white powder. The powder absorbs the dye held in the defects indicating their location.
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https://steelforge.com/literature/steelog-the-5000-word-metals-glossary/
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