27 C.F.R. § 21.100
n-Butyl alcohol
(a) Acidity (as acetic acid). 0.03 percent by weight maximum.
(b) Color. Colorless.
(c) Dryness at 20 °C. Miscible without turbidity with 10 volumes of 60° Bé1. gasoline.
(d) Odor. Characteristic odor.
(e) Specific gravity at 20 °/20 °C. 0.810 to 0.815.