49 C.F.R. § 172.530 OXYGEN placard.
Title 49 - Transportation
(a) Except for size and color, the OXYGEN placard must be as follows: (b) In addition to complying with §172.519 of this subpart, the background color on the OXYGEN placard must be yellow. The symbol, text, class number and inner border must be black. [Amdt. 172–123, 56 FR 66262, Dec. 20, 1991]
Title 49: Transportation
PART 172—HAZARDOUS MATERIALS TABLE, SPECIAL PROVISIONS, HAZARDOUS MATERIALS COMMUNICATIONS, EMERGENCY RESPONSE INFORMATION, AND TRAINING REQUIREMENTS
Subpart F—Placarding
§ 172.530 OXYGEN placard.