January 2, 2013

The Chemistry Behind Removing Graffiti

Enrico Uva, Science 2.0


AP Photo

He stood by the door of a subway car, looking from side to side to see if anyone was looking. Maybe my clothing camouflaged me against the background of my seat. More likely, I did not pose a threat, and certainly he didn't realize I was a teacher at his school. He opened his long coat, and for a moment I thought he was going to flash the ghosts of the subway tunnels when suddenly he pulled out a marker from his inner pocket and tagged an advertisement on the wall.

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TAGGED: Graffiti, Chemistry