"' Explosive forming "'is a metalworking technique in which an explosive charge is used instead of a punch or press.
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In the late 1950s, the General Electric company developed an application for five-layer sheet metal composites that had been created using the explosive forming process.
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In 1974, researchers at Eastman Kodak announced that plates treated in pure hydrogen after nitrogen treatment were more sensitive at all exposure times than untreated plates, and this was quickly adopted by many observatories, some of whom used non-explosive forming gas ( a 4 8 % mixture of hydrogen in nitrogen ) for reasons of safety.
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