Photochromes are vibrant and nuanced prints hand-coloured from black-and-white negatives. Created using a process pioneered in the 1880s, these images offer a fascinating insight into the world when colour photography was still in its infancy. A Tour of the World in Photochromes is at the Swiss Camera Museum, Vevey, until 21 August. Here: Street food in the Strada del Porto in Naples, Italy, 1899. (Photo by Swiss Camera Museum/The Guardian)

A man carries schoolchildren on his bicycle on a road in Srinagar, March 28, 2017. (Photo by Danish Ismail/Reuters)

Street vendors carry chickens for sale at Kawran Bazar in Dhaka, Bangladesh January 25, 2017. (Photo by Mohammad Ponir Hossain/Reuters)

A mahout bathes his elephant in the river Sabarmati on a hot summer day in Ahmedabad, India May 21, 2017. (Photo by Amit Dave/Reuters)

Sun Rongchun, 57, exercises with an improvised cervical traction device attached to a high bar at a sports complex in Shenyang, Liaoning province, China on April 9, 2019. (Photo by Sheng Li/Reuters)

A Hindu devotee dressed as Potharaju, the brother of the Hindu goddess Mahakali, performs during the Bonalu festival procession at the Sri Ujjaini Mahakali Temple in Secunderabad, the twin city of Hyderabad on July 18, 2022. (Photo by Noah Seelam/AFP Photo)

An Olive Ridley sea turtle hatchling releases into the sea at Lhoknga beach, Indonesia's Aceh province on January 16, 2024. (Photo by Chaideer Mahyuddin/AFP Photo)

A girl smiles during the celebration of Holi at the Art Department of the University of Dhaka in Dhaka, Bangladesh on March 8, 2023. (Photo by Mohammad Ponir Hossain/Reuters)