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Hazard Class
Each small diamond represents a different class of hazard. The hazard classes found on labels include Health, Flammability, Reactivity, and in some cases, Special Hazards.
| BLUE | HEALTH |
| RED | FLAMMABILITY |
| YELLOW | REACTIVITY |
| WHITE | SPECIAL HAZARDS |
Each hazard class uses a different color and a rating scale from 0 - 4.
