49 CFR § 172.419
FLAMMABLE LIQUID label
November 18, 2020
(a) Except for size and color the FLAMMABLE LIQUID label must be as follows:

(b) In addition to complying with §172.407, the background color on the FLAMMABLE LIQUID label must be red.
[Amdt. 172-123, 56 FR 66257, Dec. 20, 1991]