The electron spin resonance, transmission and reflection spectra showed that a steadily electron-type paramagnetic complex color point defect Fn center is produced by ⁶⁰Co γ-ray strong dose irradiation in a single crystal LiF. The γ-ray irradiation dose is too large to recognize any character peak of${\text{F}}_2^{-}$, F₂,${\text{F}}_2^{+}$, and F₃ centers in the transmission and reflection spectra of the single crystal. LiF: Fn is opaque when wavelength is shorter than about 750 nm and has not reflection when wavelength is shorter than about 800 nm. The Fn center has a wide ESR peak with ΔB_pp of 8 millitesla and the effect g-factor is 1.998±0.002.