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In page Hydrogen:
"
- Food industry: Hydrogen is an authorized food additive (E949)[6] that is used as a packaging gas,[7] and also has antioxidant properties.[8]
- Leak detection: Pure or mixed with nitrogen (sometimes called forming gas), hydrogen is a tracer gas for detection of minute leaks. Applications can be found in the automotive, chemical, power generation, aerospace, and telecommunications industries;[9] it also allows for leak testing in food packaging.[citation needed]
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