Black.: For example, air in the lungs on a chest xray.
Answered 11/19/2017
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Black: An X-ray image is a negative. Bones stop X-rays to a much larger extent than soft tissues, and they're called radio-opaque. They appear white on X-ray. Soft tissues--muscles, viscera, etc., are Lucent to X-rays, which means X-rays can pass through them--appear black.
Answered 11/17/2017
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