Some graf writers have taken the practice of scratchiti to a new level by tagging up the shatter-proof polycarbonate windows of subway trains with homemade markers filled with acidic etching solution, which eats into the plastic windows and leaves a permanent tag. As the MTA is remiss to replace these expensive windows, the tend to run rather permanently on the line.
Daily, I see many Sntatch tags on the 2/3 subway line in