Potion of object detection

Name	Cost	Weight	Probability
potion of object detection	150zm	20	42

Usage

From pot1-343.txt:

 If no objects on level and none had appeared on the map, no effect.
   "You have a strange feeling for a moment, then it passes."
     (beginner not hallucinating)
   "You have a normal feeling for a moment, then it passes."
     (beginner hallucinating)
   "You feel a lack of something."  (otherwise)
 If there are only objects in your inventory, you exercise your wisdom.
   "You sense objects nearby."  (not hallucinating)
   "You sense something nearby."  (hallucinating)
 blessed
   You detect objects on that level and exercise your wisdom.
     "You sense the presence of objects."  (not hallucinating)
     "You sense the presence of something."  (hallucinating)
     "You sense the absence of objects."  (not hallucinating)
     "You sense the absence of something."  (hallucinating)
   You know the appearance of all objects on that level (and in your
   inventory) as if you had seen them.
 uncursed
   You detect objects on that level and exercise your wisdom.
     (Same messages as above)
 cursed
   You detect objects on that level and exercise your wisdom.
     (Same messages as above)
   Mimics will appear as objects.
 hits monster
   No effect.
 vapors
   No effect.

Identification

A potion of object detection is always present in The Gnome King's Wine Cellar, a possible Mines' End. They are generated in the inventories of 50% of all nymphs , meaning you can be fairly sure a potion deathdropped by a nymph is object detection after observing just a few deathdrops.

The potion is safe to drink regardless of BUC status.

Strategy

Although hardly useless, potions of object detection are normally saved up and diluted en masse for holy water production. Other uses include the remote detection of vaults - they show up as four gold coins (provided they haven't been looted by you, or eaten by a rock mole):

$$
$$