Scientists from the Technical University of Munich have developed formulations for biometric patterns that could become the first practical indicator tattoos in the world. The concept remains the same - to create simple drawings on the human body that change their color in response to fluctuations in the concentration of key substances in the body. An interesting form of implementation - German biochemists have proposed several simple solutions.
In laboratory tests on swine skin samples, dyes were injected through the epidermis into the dermis, similar to conventional tattoos. For the first formulation, a mixture of methyl red, bromothymol blue and phenolphthalein was chosen, which is yellow by default. However, if the pH level of the skin rises above 5 and up to 9, the color of the tattoo changes to blue - the difference is visible both with the naked eye and recognized by the smartphone camera.
The next composition changes color from yellow to marsh with an increase in glucose levels, which can be interpreted as a diabetic threat. The third "cocktail" is the albumin protein detector, an indicator of renal failure, here a combination of shades from colorless to blue is chosen. All substances are cheap and easy to handle, and with proper preparation they can be applied to the skin with a conventional tattoo machine. The indicator does not require energy consumption during the monitoring process, everything works in a passive mode.
The authors of the development consider the most important not so much the fact of a simple indication of substances in the body as the ability to observe the dynamics of the process. Both the doctor and the patient will immediately notice whether changes are taking place, without taking tests and studying them for a long time in the laboratory.