Krylon gas
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Krylon gas was a gas which could be used to lethal effect with a gas-injector, contracting the victim's tissues and dissolving their bones.
Chessene o' the Franzine Grig used an injection of krylon gas (PROSE: The Two Doctors [+]Loading...["The Two Doctors (novelisation)"]) to kill the technician on duty before he could raise Space Station Camera's defences against the approaching Sontaran battle cruisers. (TV: The Two Doctors [+]Loading...["The Two Doctors (TV story)"]) His remains looked like those of a long-dead child. (PROSE: The Two Doctors [+]Loading...["The Two Doctors (novelisation)"])