49 CFR § 172.558 - CORROSIVE placard.
(a) Except for size and color, the CORROSIVE placard must be as follows:
(b) In addition to complying with § 172.519, the background color on the CORROSIVE placard must be black in the lower portion with a white triangle in the upper portion. The base of the white triangle must be 38 mm ±5 mm (1.5 inches ±0.2 inches) above the placard horizontal center line. The text and class number must be white. The symbol and inner border must be black.
The following state regulations pages link to this page.