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OK, we all agree that Aluminum is affected by a magnetic field but has less coupling than does ferrous metal. Eddy currents work to some degree or another on both.
This means that magnetic dye can be used to find those eddy currents along cracks provided the field is strong enough to make it visible.
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1971 911S, 2.7RS spec MFI engine, suspension mods, lightened
Suspension by Rebel Racing, Serviced by TLG Auto, Brakes by PMB Performance
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