What must chemical containers be labeled with to identify their contents?

Chemical containers must be labeled with signal words and pictograms to effectively identify their contents and associated hazards. Signal words, such as "Danger" or "Warning," indicate the severity of the hazard posed by the chemical, helping users quickly understand the potential risks. Pictograms provide a visual representation of these hazards, making it easier for individuals to recognize dangerous substances or materials, even if they are not fluent in the language of the labeling.

Using these forms of labeling supports safety protocols by ensuring that anyone handling the chemicals can make informed decisions about how to manage them safely, thereby reducing the risk of accidents and injuries related to chemical exposure. This aligns with best practices for chemical safety, which emphasize clear communication regarding hazardous substances.

While manufacturer’s information and use instructions, hazard ratings and barcodes, or expiration dates and storage conditions can be important components of chemical safety labeling, they do not address the immediate identification of the chemical hazards. Hence, the focus on signal words and pictograms is critical for effective hazard communication.