When consumed, the potion gives a 10% chance per log cut of finding a wood spirit, which, when found, will send any logs cut directly to the bank (among other benefits). 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. 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.