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Praxis gas (or gas of the Praxis range) was a type of gas. Celery would turn purple in Praxis gas. (TV: The Caves of Androzani)
The Fifth Doctor was allergic to Praxis gas and so kept a sprig of celery on his lapel. (TV: The Caves of Androzani)
The Already Dead soldiers used Flechette guns which used compressed Praxis gas. (PROSE: The Undertaker's Gift)