A potion of acid may not be #dipped to become water; if it gets wet, it will boil and cause you 1-10 points of damage. However, a potion of acid can be cancelled to turn it into a potion of water. If you quaff a potion of acid when you are turning to stone, you will be cured of your stoning. You will abuse your constitution and take 1-4 points of damage if blessed, 2-16 points of damage if cursed, and 1-8 points of damage if uncursed. They are best used either as an emergency stoning cure (or a primary one, for vegans and vegetarians), or as a thrown weapon.