Originally Posted by BooBoox3
can you use diffusal to purge off the purge effect from an enemy purge? (diffusal/demonic purge/stone gaze)?
No, and neither will Dispel Magic (Brewmaster's Storm panda) or Cyclone (Eul's or Tornado), both of which can remove other magical buffs. Magic immunity (e.g. BKB) will remove it though, as will "Storm, Earth, and Fire" (Primal Split), Mirror Image (e.g. Manta Style), Charm (e.g. Helm of the Dominator), and death.
For the purposes of triggered removal, it is considered a negative buff, and so is removed by any trigger which removes all negative buffs (e.g. Time Lapse) or which removes that buff specifically by ID (e.g. Dark Pact, though it doesn't remove Demonic Purge).