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A "wand"!   Never thought of you as a Fairy Godmother, Roger!   You have to explain, or I'll have visions of yards of pink gauze and a Pumpkin coach!

Philips on Twitter: "No magic wand required, just 400 LEDs to ...

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The black substance on the surface after electrolysis is probably carbon from the steel, magnetite from reduction of the rust, and maybe even some elemental iron from complete rust reduction. It should come off with a stiff brush.

Ed

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