Penetrant inspection, continuous-operation production lines in which the specimens are cleaned, liquid penetration examination, washed, dried, etc on a time cycle are common. Developer liquid penetration examination form a semi-transparent, even coating on the surface. It is also good practice to observe indications as they form because the characteristics of the bleed out are a significant part of interpretation characterization of flaws. By the s, fluorescent or visible dye was added to the oil used to penetrate test objects.
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Liquid penetrant inspection
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Dye penetrant inspection