Which process does NOT involve the use of chemicals for body preservation?

Cremation is the process that does not involve the use of chemicals for body preservation. During cremation, the body is subjected to high temperatures in a furnace, resulting in its reduction to ashes. This process does not require any chemical agents aimed at preserving the body, making it distinctly different from embalming, which involves injecting chemical solutions to delay decomposition. Disinfection may involve chemical agents to eliminate pathogens, and restoration can include both physical repair and the application of chemicals to improve appearance. Therefore, cremation stands apart as a procedure focused solely on the physical transformation of the body through combustion rather than preservation techniques.