Absinthe is a green, highly alcoholic beverage derived from wormwood, fennel, aniseed and other herbs. It is notable due to its provision of the highest Perception bonus of any consumable item, though only with a Survival skill of 100.
Absinthe does not stack separately from other alcohols such as beer etc. This despite the fact that it does have slightly different effects—Perception +1 instead of Strength +1. However, Dixon's whiskey and moonshine both stack separately from this and other alcohols.