text: human dead bodies are treated by a process called embalming in which 2-4% concentration formalin is used. this can either be injected into the blood vessels if the last rites of the body are to be performed otherwise the bodies are kept in containers filled with formalin if they are required for anatomical studies.since formalin is as aqueous solution of formaldehyde, the chemical formular for formaldehyde is HCOH a compound made commonly by oxidation of methyl alcohol.