Magnafluxing is magnetic particle inspection done by running a liquid (with metal particles) over the ferrous object. While the liquid is running over the object, it is viewed under a fluorescent UV light. The metal particles will fall into any cracks which are then detected as a line under the UV light. This tells you that you've got a crack or flaw in the piece that may render it unsafe.
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Vigilantibus et non dormientibus jura subveniunt. Molon Labe!
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