Deep in the Catacombs of St. Domitilla in Rome, archaeologists have used laser technology to remove centuries of grime to reveal several Christian frescoes dating to the 4th century AD. The frescoes had been covered by a thick layer of calcium deposits, algae, and smoke from oil lamps. Using lasers, the experts removed the filth while leaving the colorful paintings beneath. These frescoes belonged to two wealthy Roman merchants and include Christian scenes, such as Noah's Ark, Jesus feeding the five thousand, and Christ the shepherd carrying a lamb on his shoulders.
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- http://www.telegraph.co.uk/news/2017/05/30/laser-technology-uncovers-1600-year-old-christian-frescoes-romes/