This can be maintained on a second by second basis to produce a continuous spray of acid.

Innate Attack (Corrosion, Beam) 3d [18] 
    Jet [+0%] 
    Magical [-10%] 
    Spell Components [-30%] 
        Must say "acid" in Latin 
        Must gesture with hands 
        Must hold a vial of acid ($10) 
Level 2 [27] 
    Add Extended Duration (x3) [+20%] 
    Add Increased Range (+100%) [+10%] 
Levels 3-5 [36/45/54] 
    Increase Extended Duration by 1 step [+20%] 
    Increase Increased Range by +100% [+10%]