In 1912, the Guardian reported on the discovery of Palaeolithic rock art on the walls of Bacon Hole, a cave near the Mumbles in south Wales – only for the painted panel’s authenticity to be dismissed by 1928.
A series of horizontal bands in red pigment were subsequently deemed no more than a natural phenomenon and the newspaper added an updated statement: “It was later established that the red streaks … turned out to be red oxide mineral seeping through the rock and not prehistoric art.”
