We report further UKIRT spectroscopic observations of Sakurai's object (V4334 Sgr) made in 1999 April/May in the 1-4.75μm range, and find that the emission is dominated by amorphous carbon at Td~600K. The estimated maximum grain size is 0.6μm, and the mass lower limit is 1.7+/-0.2×10-8Msolar to 8.9+/-0.6×10-7Msolar for distances of 1.1-8kpc. For 3.8kpc the mass is 2.0+/-0.1×10-7Msolar. We also report strong Hei emission at 1.083μm, in contrast to the strong absorption in this line in 1998. We conclude that the excitation is collisional, and is probably caused by a wind, consistent with the P Cygni profile observed by Eyres et al. in 1998.