We demonstrate nonvolatile two-color holography in an as-grown congruent LiNbO3: In crystal of 2.2 mm thickness. We show that the nonvolatile two-color holographic performance of the crystal is significantly improved as compared with that of other congruent LiNbO3 crystals reported so far. The figure of merit M/# and the two-color recording sensitivity S are measured to be; 0.04 and; 3.531024 cm/J, respectively, with a writing intensity of 4 W/cm 2 at 780 nm and a gating intensity of 1.15 W/cm 2 at 488 nm. These values are comparable to those of unreduced near-stoichiometric LiNbO3 crystals under similar recording conditions.