Talking with my friends about the "alchemy" of the Alchemist class, we're fighting about the alchemist extracts. Look at this description:
Extracts are the most varied of the three. In many ways, they behave like spells in potion form
OK, now, we can assume that extracts are potions in some way, right? Now, look at this ability from the black dragon:
Corrupt Water (Su): Once per day an adult or older black dragon can stagnate 10 cubic feet of still water, making it foul and unable to support water-breathing life. The ability spoils liquids containing water. Liquid-based magic items (such as potions) and items in a creature's possession must succeed on a Will save (DC equal to the dragon's frightful presence) or become ruined.
Whoa! My alchemist occupies a space of 5 feet, and his extracts "are" potions. Now, he make a will save against this ability or not? Two to four alchemists can be affected by this ability?