In what color combination must a piping system that carries dangerous materials be identified?

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A piping system that carries dangerous materials must be identified with black letters on a yellow background. This color combination is universally recognized for warning and cautioning individuals about potential hazards, particularly in industrial and manufacturing settings. The use of black letters provides high contrast against the yellow background, ensuring visibility and readability even from a distance or in low-light conditions. Proper labeling is crucial for safety, as it alerts workers and emergency responders to the potential hazards associated with the materials flowing through the pipes, thus helping to prevent accidents and ensure compliance with safety regulations.

The other color combinations do not convey the same immediate hazard warning associated with dangerous materials. For instance, red letters on a white background typically denote fire-related equipment or emergency signals, while white letters on a blue background are generally used for informational signs. Lastly, green letters on an orange background do not conform to established hazard communication standards. Understanding these designations is essential for maintaining a safe work environment and ensuring that all personnel can identify potential dangers effectively.

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