Which of the following is NOT a requirement for hazmat labels?

The requirement for hazmat labels to be clearly visible is crucial because it ensures that anyone handling or encountering the hazardous materials can identify the hazards quickly and accurately. Visibility is essential for safety, allowing for prompt recognition of the potential risks and appropriate responses.

Proper positioning of the labels is also necessary because it ensures that they are placed in a way that maximizes visibility and comprehension by those who may need to read them. Additionally, the durability and weather resistance of hazmat labels are important factors, as these labels must withstand various environmental conditions without becoming unreadable.

In contrast, labels obscured by markings or attachments would defeat the purpose of having clear hazard communication. If a label is hidden or difficult to read due to other markings or physical obstructions, it can lead to severe safety risks, as necessary information may not be conveyed effectively. This is why the option indicating that labels can be obscured is not a requirement and is considered incorrect.