Scientists in Germany are creating tattoo inks that change color based on the levels of certain health markers in the blood.
Scientists are developing color-changing inks that may one day be used to create health-monitoring tattoos.One of the dyes responds to pH, and gradually changes between yellow and blue depending on whether the blood is more or less acidic. In a healthy scenario, the pH-measuring tattoo ink would always look dark green. Another dye reacts to changing glucose levels by changing from light green to dark green and could help people manage their diabetes.
One particular challenge will be to make the color changes reversible. So far, only the pH-sensing ink is able to turn back to its original color after it has measured a change in blood pH levels. But the glucose- and albumin-responsive dyes only change in one direction.
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