"Why would you want this?"--- Thaumonomicon Entry
This research is forbidden knowledge (minor). These nasty little vials allow you to create taint patches anywhere you like, by using (right-clicking) them on the ground. Aside from simply creating Tainted ground for flux farms and the like, the Tainted land can be used to convert a Hungry node into a marginally-less-dangerous Tainted node. After creating Bottled Taint for the first time, the player that made it will gain Warp.
Cleaning Taint is one thing, but ever considered spreading it?
Chuck a phial of Vitium into a crucible containing 8x Vitium and 8x Praecantatio.