BiggusGeekus
That's Latin for "cool"
Eh.
Pitch 'em a softball first.
Have the good potions labeled with the skull-and-crossbones for poison and the poison labeled with the word "cure" or whatever. The bad guy knows that they're reveresed. It's "realistic" in the sense that the bad guy might want to keep poison and healing potions, but he also wouldn't want his minions shoplifting, so he mislabels them.
You'll install the same level of fear and terror into the PCs, but you'll have a reason for it. Players tend not to mind getting the shaft as much when there's a good reason behind it.
Pitch 'em a softball first.
Have the good potions labeled with the skull-and-crossbones for poison and the poison labeled with the word "cure" or whatever. The bad guy knows that they're reveresed. It's "realistic" in the sense that the bad guy might want to keep poison and healing potions, but he also wouldn't want his minions shoplifting, so he mislabels them.
You'll install the same level of fear and terror into the PCs, but you'll have a reason for it. Players tend not to mind getting the shaft as much when there's a good reason behind it.