Hazardous Information Guide.
Occupational Safety and Health Administration (OSHA) regulations require that hazardous materials such as solvents, inks and cleanup solutions be marked with a Hazardous Materials Identification System label.
The HMIS label is a diamond-shaped label that is divided into four color-coded categories. The categories are rated by number from zero to four, indicating the degree of hazard. These categories are:
Health Hazard (blue). Indicates the health hazard of using a material with four being fatal.
Flammability (red). Indicates the material's flashpoint with four being below 73°F.
Reactivity (yellow). Indicates detonation sensitivity of a material with four being extreme.
Special (white). Indicates whether the material is a chemical base that might react violently with air and water. It also includes recommended personal protection equipment (PPE).
FIGURE 117 in FPP Vol. 6