G'morning Paul, 

 PR> Magnesium worksjust dandy.  Powdered magnesium and iron filings
 PR> was how they used to weld railroad rails.

As I recall the constitution of thermite,  wasn't it powdered 
aluminum and iron ignited by magnesium that welded railroad rails 
and other artifacts ?

Setting light to magnesium tape was one of the joys of my early 
youth ... awesome light !

:-))
 
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