Color Code for Markers: ANSI A13.1-1981 Standard Scheme for Identification of Piping Systems.

Yellow / Black Lettering

Materials Inherently Hazardous:

Flammable,Toxic, Explosive, Chemically active or Explosive.

Red / White Lettering

Fire Quenching Materials:

Indicates Sprinkler Systems and Fire Protection Equipment.

Green / White Lettering

Inherently Low Hazard Material:

Non-Toxic, Non-Poisonous, Does not produce fire or explosions.

Blue / White Lettering

Inherently Low Hazard Gases:

Identifies Gases with little or no threat to Life or property.