NFPA 704
The color BLUE represent this.
What is Health?
The color RED represents this.
What is Fire Hazard?
NOT 6...7... the rating for NFPA 704 only goes this high.
What is 4.
Don't use this, notated by a capital "W" with a slash through it.
What is water?
Special Hazards are noted in this color box.
What is white?