Scientists have developed a revolutionary method for viewing internal body structures. They use a common yellow food dye found in snacks like Doritos.
Researchers at Stanford University utilized tartrazine, the dye’s active chemical, to render mice transparent, exposing their blood vessels, muscle fibres, and gastrointestinal movements. The method, published in Science, involves applying a tartrazine solution to the mice’s skin, temporarily turning it see-through.
This innovation could transform biological research, enabling non-invasive studies of brain activity and the diagnosis of internal disorders. Guosong Hong, a Stanford materials scientist and study co-leader, pointed out potential uses in identifying deep-seated tumours and enhancing cosmetic procedures.
The technique operates on optical principles, where tartrazine reduces tissue light scattering, thus enhancing transparency by altering light refraction, akin to the invisibility concept in H.G. Wells’ “Invisible Man.”
Early tests demonstrated that chicken slices immersed in tartrazine turned transparent, and when applied to mice, it revealed their internal anatomy without causing significant harm. The dye is also easily removable, reverting tissues to their original appearance.
While not yet applied to human subjects, the approach is promising for advancing medical imaging and research. Future directions include testing different dyes for efficacy at lower concentrations and exploring applications on human tissues, pending ethical approval.
