The National Fire Prevention Association (NFPA) developed a rating system to identify and rank the hazards of a material. If you have previously worked in construction you’ve probably seen the colorful labels used to explain these hazards. The NFPA’s hazard rating is diamond-shaped, made up of four smaller diamonds. The NFPA symbol colors are blue, red, yellow and white. Inside the colored smaller diamonds are numbers or symbols loaded with a wealth of knowledge.