A Guthix balance flask is a potion flask originally containing six doses of Guthix balance. It is created by using Guthix balance on a potion flask.
Guthix balance potions and flasks are used against frozen Vampyre juveniles, Vampyre juvinates or Vyrewatch. After freezing a vampyre with the Rod of Ivandis or Flail of Ivandis, the usage of the potion has three outcomes: the vampyre will be destroyed, the vampyre will become angry (+10 combat level, but vulnerable to all attacks), or they will be returned to human form. Using it on a held Vyrewatch will simply deal a random amount of damage.
The flask is made by blowing robust glass, requiring 89 Crafting and giving 100 experience. Red sandstone can be mined at Oo'glog and smelted using the robust glass machine also located at Oo'glog.
To decant the potion into the flask, one must have at least 6 doses of Guthix balance in their inventory, as well as one or more potion flasks. Using the flask on the potion will open a menu to decant them. The optimal inventory setup for decanting potions is 17 4-dose potions and 11 flasks.
Only the original, six-dose potion is tradeable. Once the potion has been partially drunk, no more doses can be added to it. After all six doses have been consumed, the flask will shatter and disappear. Flasks can be combined together, but the empty flasks will still be destroyed afterwards.
If the full, 6-dosed version of this potion is consumed, each dose would cost about 4768.3 coins.
This information has been compiled as part of the update history project. Some updates may not be included - see here for how to help out!