Researchers believe the graffiti was jotted down just a few days before Vesuvius erupted in 79 AD— but in October, instead of August as believed. | A charcoal writing found on the wall of a house that was undergoing renovations in the year of the eruption, states that someone “indulged too much in food here on the sixteenth day before the kalends of November” meaning on 17 October. Charcoal is a volatile material that doesn’t withstand time. |  |