Iron doors should be able to take water damage and become rusty. Once rusty, it should be possible to break an iron door like a normal wooden one.
Alternatively, iron doors should be corrodable by throwing or smashing acid on them, with it taking 2-3 potions to weaken a door to the point of destroyability.
Monsters carrying a potion of acid as well as some other potion that they would normally drink may accidentally drink the acid by mistake.
You can apply or otherwise dump a potion of acid into a sink to flush out the black pudding in the pipes, if the sink hasn’t yet produced one.
When a thrown potion of acid hits a creature, it may corrode some corrodable armor of that creature.
Dipping a unicorn horn in acid dissolves and destroys the horn, producing a potion of healing.
Potions of acid and oil are immune to freezing and shattering.
When acid breaks on someone’s head and spills on them, it actually does more damage than quaffing it, because it is spread out over more surface area.
The “weakest” beatitude of the potion of acid (usually blessed in vanilla, but if #1918 is implemented it will be cursed) may not cure stoning.
Swap the blessed and cursed effects of the potion of acid, which means that blessed acid is more powerful acid, while cursed acid is kind of cruddy.
Potions of acid have a splash radius effect when broken (could probably be implemented as an acid explosion).
Whenever a diluted potion of acid would be created (i.e. by wishing or polypiling) it immediately explodes in an alchemic blast.
F corpses can be dipped into potions to make different potions: juice + violet fungus = booze, juice + yellow mold = sickness, water + green mold = acid. (Note the existence of the Brewing Patch, which dissolves most F in juice to produce confusion, hallucination, booze, sleeping, and healing.)
Later suggested recipes which involve dipping a corpse in acid to dissolve it:
You can dip fruits (slime molds) in a potion of acid (or potion of water?) to turn it into a potion of fruit juice (consuming the fruit).
