Parts of the Cerro Lagoon in the Paraguayan city of Limpio show purple water discoloration on December 20, 2020. The assumption is that the incident is related to the nearby Waltrading SA tannery. When water samples are taken on site, the color of the water is due to the presence of heavy metals such as chromium, which are commonly used in the tannery. (Photo by Jorge Saenz/AP Photo)
