of nitric acid and sal ammoniac; ... "
* Wisniak, Jaime (2009) "Carl Wilhelm Scheele," Revista CENIC Ciencias Químicas, 40 (3): 165-73; see p. 168: "Early in the seventeenth century Johannes Baptiste van Helmont (1579-1644) mentioned that when sal marin (sodium chloride) or sal ammoniacus and aqua chrysulca (nitric acid) were mixed together, a flatus incoercible (non-condensable gas) was evolved."

Isolation

The element was first studied in detail in 1774 by Swedish chemist Carl Wilhelm Scheele,

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