The firefighter will use the yellow section of the ERG when he or she knows the chemical name of hazardous material.
ERG is divided into four-colored sections: yellow, blue, orange, and green. The function of the yellow pages in ERG is to list the chemicals in numerical order on the basis of their given ID or UN number. If one finds a four-digit number in the Center, one can find the chemical name in the yellow pages which can tell the name of the chemical and the guide number to resolve the issue faster. It means it is radioactive.: The yellow pages list chemicals in numerical order based on their assigned ID number (UN number). If you are reading a placard or label which has a four-digit number in the center, you can look up the chemical name in the yellow pages.
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