Summary:
- Researchers have discovered that a common yellow food dye, tartrazine, can be used to create images that allow doctors to see beneath the skin's surface.
- The dye can be injected into the body and then illuminated with near-infrared light, which causes it to emit a fluorescent signal that can be detected with a camera.
- This technique could potentially be used to visualize blood vessels, lymph nodes, and other structures, potentially improving medical procedures and diagnoses.