There are two types of Potion of Invisibility, one with the correct current color and one with the color before the devs changed it (which matches the Greater Confusion color but the color was changed because it bugged out the macros on the Enhanced Client)
If you are unfortunate enough to put both on your commodity vendor, you won't be able to get one of them off your vendor, you won't be able to price them, and you have to just let your vendor expire completely and then wait a week for the stuff to degrade out of the warehouse superintendent before you can get a commodity vendor again.
Not sure if a GM can fix temporarily (or at least retrieve the potions off) but since I just accidentally did it...will find out in about 6 hours.
Also does it for medusa scales and the various gorgon lens but that is another bug for another post.
If you are unfortunate enough to put both on your commodity vendor, you won't be able to get one of them off your vendor, you won't be able to price them, and you have to just let your vendor expire completely and then wait a week for the stuff to degrade out of the warehouse superintendent before you can get a commodity vendor again.
Not sure if a GM can fix temporarily (or at least retrieve the potions off) but since I just accidentally did it...will find out in about 6 hours.
Also does it for medusa scales and the various gorgon lens but that is another bug for another post.