Not everyone knows that in addition to body art tattoos, there are medical tattoos. Doctors use them to indicate the site of treatment, in particular, a type of skin cancer - basal cell carcinoma. True, the ink used for this purpose causes some problems. Recently, researchers have created a special paint that glows under special lighting and disappears without a trace after a few weeks.
Skin cancer patients sometimes have to wait three months between biopsies to analyze their condition. Carbon, graphite, mascara, or fluorescent dye are usually used to mark the area of the skin that is subject to the next stage of treatment. In the future, to get rid of them, it was necessary to resort to laser or surgical removal, which is an additional burden for the patient who underwent surgery.
A group of Chinese researchers, which included Kai Chen, Gary Zhuang, Hsian-Rong Zeng, developed a safe version of the dye by cross-mixing fluorescent nanoparticles. In normal light, these particles are not visible, which eliminates unwanted marks on the skin. But in light with a wavelength of 460 nm, the pigment begins to glow. Experiments on mice have confirmed that nano-tattoos do not cause inflammation and disappear without a trace after three months.