Researchers have developed a new material that changes based on the different pH values of a wound.

From a paper cut to a gash, no one enjoys having a wound. Constantly removing the bandage to check for infection is a nuisance that exposes the cut and allow germs to enter. Scientists at the Fraunhofer Research Institution for Modular Solid State Technologies EMFT have integrated an indicator dye into a bandage and plaster that reacts to different pH values. When an infection is present, the color of the bandage changes from yellow to purple. The researchers ensured the dye remained chemically stable when bonded to the fibers of the bandage or the plaster so it didn’t get into the wound. They also guaranteed that the indicator revealed clear change in color and reacted sensitively in the right pH range. This breakthrough makes it possible to regularly check wounds from the outside without disrupting the healing process.

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