Absorption spectra of C60 film reduced electrochemically in a cell composed of solid polymer electrolyte and LiClO4 are studied. The results are compared with data of C60 anion solutions and films doped with alkali metals by vapor phase. Little difference is found in absorption spectra between the solutions and films of reduced C60 up to di-anion at least. This fact indicates that the interaction between fullerene molecules in solid film is not significant, or is very small as in the solution.
