The photo is part of a series of images colourized by technician Royston Leonard, 55, from Cardiff in Wales  . ... The photos have been colourized by electrician Royston Leonard, 55, from Cardiff, Wales who spends up to five hours working on each individual photo. ..…

In 2003, when toxic effluent from the quarry started leaking into people’s streams in Grosfaen, just outside Cardiff, the Environment Agency – a government agency concerned with flooding and pollution – was hired to clean up the site in 2005. . ..…