The NFPA 704 marking system alerts emergency responders to the presence of hazardous materials. ... Red indicates flammability, blue health, yellow instability and white special information.

As far as the NFPA 704 signage colors -- blue (health), red (fire), yellow (instability), and white (blank) sections -- the key to remember is that the diamonds must be viewable from a distance to ...

One such sign is NFPA 704 – perhaps better known as the “fire diamond.” An NFPA 704 sign out in the wild. According to the sign, whatever is behind that door is very, very dangerous and ...

As far as the NFPA 704 signage colors -- blue (health), red (fire), yellow (instability), and white (blank) sections -- the key to remember is that the diamonds must be viewable from a distance to ...