Class 4 Flammable Solid Labels

"The background on the FLAMMABLE SOLID label must be white with vertical red stripes equally spaced on each side of a red stripe placed in the center of the label. The red vertical stripes must be spaced so that, visually, they appear equal in width to the white spaces between them. The symbol (flame) and text (when used) must be overprinted. The text ‘‘FLAMMABLE SOLID’’ may be placed in a white rectangle." [CFR, Title 49, §172.420]