Taking a cue from the old T-shirts that hail all the way back from the 1980s that could change color according to your body temperature thanks to a conductive dye, Karpati’s material that is known as Chromosonic will also make use of the same kind of dye, except that the remainder of the color-changing process is far more technologically advanced.
Karpati’s idea will make use of nichrome wires that have been woven into the fabric itself, and these will be hooked up to an Arduino microcontroller. In turn, the Arduino controller is connected to a power supply. Whenever the wires get hot in response to sound, the temperature will change, hence affecting the color of the dye so that it can change, alongside altering its pattern, too. Will it be able to see a military application down the road? I would not bet against that.