Throw Splash Weapon
A splash weapon is a ranged weapon that breaks on impact, splashing or scattering its contents over its target and nearby creatures or objects. To attack with a splash weapon, make a ranged touch attack against the target. Thrown splash weapons require no weapon proficiency, so you don't take the –4 nonproficiency penalty. A hit deals direct hit damage to the target, and splash damage to all creatures within 5 feet of the target. If the target is Large or larger, you choose one of its squares and the splash damage affects creatures within 5 feet of that square. Splash weapons cannot deal precision-based damage (such as sneak attack).
EDIT: And more to the point I guess after rereading, they are specific weapons (i.e. thrown splash weapons), so they are not counted as improvised either.
Thanks. I had read that but I wasn't sure if it always applied. What got me curious is the Alchemist class gets "Throw Anything" as a feat. Why would the authors think that class needed it?
"Needed" might be a strong word, but I think thematically it's very appropriate in that case. Their main schtick is throwing stuff day in day out, it makes a certain flavor sense that they're better at chucking things than most people.