Final answer:
The purple book mandates that WHMIS 2015 supplier labels must use standardized symbols for consistency in conveying health and safety information on hazardous products.
Step-by-step explanation:
The purple book contains rules that specify how supplier companies must create WHMIS 2015 supplier labels using standardized symbols. WHMIS 2015 stands for the Workplace Hazardous Materials Information System, and the standardized symbols are used to convey health and safety information on hazardous products consistently. This system is designed to provide critical information to help protect workers in the workplace.
It's important to note that while other aspects like colors, shapes, and fonts can be part of label design, WHMIS strictly standardizes the use of symbols to ensure clear and universal communication of hazards. These symbols must meet specific criteria for design, ensuring that they are easily recognizable and understood by employees, regardless of where they work or the language they speak.