Potion recipes make claims to such effects as: curse removal, securing the love of the drinker for the brewer (for a duration of one month), multiplying any nonmagical liquid to fill its container (size of container unspecified but from context they seem to be thinking flagons or barrels rather than lakes or ponds), and a dozen varieties of curse including warts, plague, petrification, loss of assorted facial features, and 'to Burn with an Unquenchable Flame'.