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This test is used for location/identification of surface defects, detection
of cracking in welded joints or of fatigue cracking in stressed materials.
The surface of the material being tested is coated with a penetrant which
contains a dye. The penetrant will seep into any open areas on the
material. After the excess penetrant is cleaned from the surface of the
sample, a developer is applied. The developer lifts the penetrant out of
the defect, and the dye stains the developer, creating an outline of the
defect or crack.
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