What should you not rely solely on to identify the contents of a container?

Relying solely on color to identify the contents of a container can be misleading for several reasons. Many gases or liquids can appear similar in color, and color can vary based on lighting conditions or the presence of impurities, which may not accurately represent the actual substance. Additionally, different materials may also exhibit similar colors, making it difficult to distinguish between them based solely on this characteristic.

Labels, on the other hand, are designed to provide clear and vital information about the contents of a container, while shape and weight can offer additional clues. Therefore, color should not be the sole criterion for identification, as it does not provide the reliable and definitive information necessary for safely handling substances, especially in situations involving potentially hazardous materials.