What does a blue color indicate on an X-ray scanner?

The correct answer indicates that a blue color on an X-ray scanner signifies the presence of inorganic materials, which include metals such as firearms and knives. This is important in contexts like security, where identifying potential threats or prohibited items is crucial. Inorganic materials typically have higher atomic densities, causing them to absorb X-rays differently than organic materials, leading to their distinct coloration on scanning displays. This differentiation is vital for security personnel to quickly assess what items are present in a bag or on a person, facilitating informed decision-making regarding safety protocols. Understanding this helps officers recognize items that may pose a risk, allowing them to take appropriate actions based on the nature of the detected materials.