https://scitechdaily.com/a-window-into-the-body-stanford-scientists-use-food-dye-to-make-skin-temporarily-invisible/
"Looking forward, this technology could make veins more visible for the drawing of blood, make laser-based tattoo removal more straightforward, or assist in the early detection and treatment of cancers,″ said Stanford University assistant professor of materials science and engineering Guosong Hong, a U.S. National Science Foundation CAREER grantee who helped lead this work."
