Enjoy memorizing this hospital sign!
How about just announcing the issue rather than matching it first with a color? For example: “Attention, tornado!” seems like it would be effective.
Elopement, by the way, means a patient with Alzheimer’s needs to be located. That makes “purple” a code within a code (and makes me want to watch Inception again). This is also one of the few I could understand wanting to disguise with a color.
“Shooter” is another candidate for obfuscation, although I imagine the shooter would quickly figure out that any announcements were about them, while hospital denizens look around and say “Huh, we’ve never heard code silver before. Sounds like something to do with Alzheimer’s.”
Photo credit Jason Boyles.