Chinese authorities have launched an investigation into reports of formaldehyde, a known carcinogen, being used to preserve cabbages for human consumption. Officials in Hebei province verified footage showing individuals dipping cabbages in a solution before loading them for transport. The use of formaldehyde for food preservation is strictly prohibited in China, the world's largest producer and exporter of cabbages. Police have taken legal action against those involved, and officials are conducting spot checks nationwide to prevent panic and restore confidence.