(a) Color. White or yellow.
(b) Specific gravity at 20 °C. 1.95 to 2.10.
(c) Melting point. 360 °C.
(d) Boiling point. 1320 °C.
(e) pH (0.1M solution). 13.5.
[T.D. TTB-140, 81 FR 59462, Aug. 30, 2016]