Graffiti vandals have been using Hydrofluoric Acid (HF) to burn their "tags" (names) into glass surfaces on the rail Network. Bingo Dabber Acid Etching is a form of graffiti that has started to show up in the UK. The etching acid (containing the hydrofluoric acid and other harmful substances) has been found in empty bingo dabbers or large markers wrapped in masking tape.

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