||This article contains information about a subject known only to exist in the game APIs or cache.
The content is not known to be accessible in game, or may be reserved for use in a future update.
Deep blue sweets are remnants from the 2005 Halloween event that still exist within the game cache, but are unobtainable anywhere in-game.
During the event, players were able to trick-or-treat the children around Lumbridge. They could either trick them with a Zombie head to receive some sweets, or treat to give them back. When eaten, steam came from the players' ears. They melted into chocolate dust after the event was removed.