Pipeline and Haz. Matls. Safety Admin., DOT - WHEN WET - must be at least 25 mm (1.0 inches) high. The symbol, text, class number and inner border must be white. [Amdt. 172-123, 56 FR 66263, Dec. 20, 1991] Section 172.550 Section 172.552 (b) In addition to complying with Section 172.519, the background color on the OXIDIZER placard must be yellow. The symbol, text, division number and inner border must be black. [Amdt. 172-123, 56 FR 66263, Dec. 20, 1991] OXIDIZER placard. (a) Except for size and color, the OXIDIZER placard must be as follows: Section 172.552 ORGANIC placard. PEROXIDE (a) Except for size and color, the ORGANIC PEROXIDE placard must be as follows: VerDate Sep<11>2014 16:41 Oct 31, 2018 Jkt 244226 PO 00000 Frm 00447 Fmt 8010 Sfmt 8010 Q:\49\49V2.TXT PC31 EC02MR91.054 437