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"i have always heard that fuchs bend before they break, IE, no cracks."
On occasion, they crack. Some photos in the archives confirm that.
Magnaflux is a trade name for crack-testing ferrous metals. The company also has a process for testing non-ferrous materials. Apparently, they also own the Zyglo trade name (flourescent dye test).
If your application requires the utmost safety, I'd test.
If you're buying used wheels for your street car, it's up to you. A close physical inspection along with one of many crack-testing kits might be prudent.
Sherwood
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