GLACIESDRACO'S PROFILE

So I've got this investigator character. They have a skill which calls a common event; it sets the screen to grayscale, memorizes the current BGS and then plays a suitably noir theme, and opens up new dialogue when examining various events based on if the 'NOIRVISION' switch is on. Triggering the skill again while it's active sets things back to normal - screen hue goes back to the usual balance, the memorized BGS is played, and the optional dialogue doesn't show.

How do I make this effect go away every time the player wanders into a new map without hardcoding it in every teleporter?