Products with more than one hazard will have multiple hazard classification symbols on the label and on the SDS (Safety Data Sheet).
By being able to recognize the symbols you are able to visually recognize the danger from a distance. Always understand the products you are working with and understand all requirements to work with the products or materials safely. If you are not sure what you working with, do not use or touch the product and get specific instructions from your Supervisor. Recognize the symbols, read the labels and read and understand the SDS as it relates to the product or material.