Safety Color Code for Marking Physical Hazards §1910.144(a)(1)(i)–(iii), (3)

Red

Red is the basic identification color of:

• Fire protection equipment and apparatus
• Danger
• Stop

Safety cans or other portable containers of flammable liquids that have a flash point at or below 80°F, table containers of flammable liquids (open cup tester), excluding shipping containers, have to be painted red with some additional, clearly visible identification either in the form of a yellow band around the can or the name of the contents clearly stenciled or painted on the can in yellow.

Red lights must be provided at barricades and at temporary obstructions, as specified in ANSI Safety Code for Building Construction, A10.2-1944.

Danger signs have to be painted red.

Emergency stop bars on hazardous machines such as rubber mills, wire blocks, flat work ironers, etc., must be red.

Stop buttons or electrical switches on which letters or other markings appear, used for emergency stopping of machinery must be red.

Yellow

Yellow is the basic color for designating caution and for marking physical hazards such as:

• striking against,
• stumbling,
• falling,
• tripping, and
• caught-in-between.