Dye penetrant inspection

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Notion

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Science and technology

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What Wikipedia says

Dye penetrant inspection (DP), also called liquid penetrate inspection (LPI) or penetrant testing (PT), is a widely applied and low-cost inspection method used to check surface-breaking defects in all non-porous materials (metals, plastics, or ceramics).

Excerpt from the Wikipedia article “Dye penetrant inspection”, under the CC BY-SA 4.0 license. Read the article on Wikipedia