The term graffiti derives from the Italian graffito meaning ‘scratching’ and can be defined as uninvited markings or writing scratched or applied to objects, built structures and natural features. Graffiti is a phenomenon which can be found on ancient structures around the world, in some cases predating the Greeks and Romans. Historical examples now have a significance of their own, and can throw light on the society of the period. Despite its long history, graffiti is a problem that has become particularly pervasive over the last fifty years as a result of the availability of cheap and quick means of mark-making. These include biros, felt and marker pens, correcting fluid and stickers as well as the ubiquitous spray paints.