Graffiti can now be removed in minutes without damaging underlying art

Found on New Scientist on Tuesday, 27 April 2021
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Michele Baglioni at the University of Florence in Italy and his colleagues have developed a system that allows cleaning agents to remove just the top layer of paint, which is only a few microns thick.

Depending on the thickness of the paint and its age, graffiti may be ready to be removed just a few seconds or a few minutes after the hydrogel is applied. But each removal operation is unique, and the cleaning material must first be tested on a small area of the graffiti to establish the optimal application time.

Hopefully sprayers will get bored enough and quit when their "art" vanishes quickly again.