It dates back at least to 1962 when the U.S. Department of Agriculture required that it appear on pesticide labels. Today, it appears on many types of products. Consumers need to pay attention to the information on these labels to reduce risks to humans, minimize waste and prevent harm to other species and the environment.
Signal words represent just how dangerous the product is.
In many products, it is these very properties that make them desirable to do the jobs for which they are intended. Pesticides, for example, are designed to kill insects and animals, and drain cleaners are made to be chemically reactive. Because many products are inherently dangerous, the U.S. Department of Agriculture requires product labels listing the hazards of improper use and disposal. Reading the labels thoroughly allows consumers to make informed decisions. Directions for use, storage and disposal usually are provided as well and should be followed carefully to help minimize health risks.