Scraping Decades of Grime, Car Exhaust, and Mold Off Rome’s Colosseum
The Colosseum in Rome is being cleansed of car exhaust that has built up over decades, ever since Mussolini’s ill-advised decision to build a major road nearby. The exhaust, however, is just part of an overall mixture known as “black rust,” CBS News reports: “Exhaust, pollen, algae and fungus growths form a coating the restorers…