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Praxis gas was a type of gas. Celery would turn purple in praxis gas. The Fifth Doctor was allergic to gas in the praxis range and so kept a sprig of celery on his lapel to identify its presence. (TV: The Caves of Androzani)
The Already Dead soldiers used Flechette guns which used compressed praxis gas. (PROSE: The Undertaker's Gift)
In 2154, IMC trooper Jason Dommer had his throat scarred by praxis gas, making his voice scratchy and grating. (PROSE: Lucifer Rising)