Black particles found in the freshwater supply at two public housing estates are mainly bitumen, authorities have said, while stressing that the water is safe to drink. The government said on Thursday that its tests showed the bitumen, which is banned from use in pipes, was mixed with resin. Residents at two public rental and subsidised estates, Queens Hill Estate and Shan Lai Court in Fanling, first reported the presence of black particles in their drinking water on Friday last week. Director...