What is PYROPHORIC ALLOYS?

Alloys made of a mixture of rareearth metals with about 30 per cent, of iron a sparking substance used in making cigar lighters and for tracing the flight of shells, the friction ot the air generating sufficient heat to cause a piece of the alloy attached thereto, to burst into flame and thereby indicate their path. The cerium is obtained from the residues of the gasmantle industry.

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Definition of  PYROPHORIC ALLOYS