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“more radiopaque”
radiopaque (adjective), more radiopaque, most radiopaque
Descriptive of not allowing the passage of radiation; especially X-rays, gamma rays, or other forms of radiant energy to be used: In diagnostic X-ray imaging, it is sometimes necessary to introduce special radiopague dyes into the body to make the organs stand out more clearly.
During the procedure for obtaining X-ray pictures of the urinary system, or urography, the technique involves the introduction of a radiopaque, iodine-based dye into the kidneys, ureters, and bladder so they will show up better on X-rays.