magnetic inspection oil

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magnetic inspection oil [mag′ned·ik in′spek·shən ‚ȯil]

(metallurgy)

A light petroleum oil, such as kerosine or naphtha, to which has been added fine ferromagnetic particles (usually colored black or red for contrast) to form an inspection penetrant; when the penetrant is applied to a metal surface being inspected, the ferrous particles accumulate in any surface cracks by magnetic attraction, thereby permitting the cracks to be discernible.

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