Time-resolved deSenerate four-wave mixins experiments were conducted on toluene solutions and film of C6o using the second harmonic generation of a 50 picosecond mode-locked Nd: YAG laser. A fast nonlinear optical response was observed from both Ceotoluene solutions and C6o film, and another iong-lived comPOnent was observed only from C6o toluene solutions. The near resonant third-order nonlinear optical susceptibility of Cio estimated from the experimental result of the film is about (3.6±1.4)×10-10 esu.