[Durgical](https://durgical.com/en/) › [DurgiPedia](https://durgical.com/en/durgipedia/) › [Forensic medicine](https://durgical.com/en/forensic-medicine/) › [Thanatology](https://durgical.com/en/forensic-medicine/areas/thanatology/) › Preservative changes: adipocere, mummification, skeletonisation # Preservative changes: adipocere, mummification, skeletonisation - Finding In some conditions a body does not fully putrefy: fat turns to a waxy substance (adipocere) or tissues dry out (mummification). Updated Nov 5, 2026 ## Key points - Adipocere: fat turned to wax; needs moisture, little oxygen and fatty tissue (bodies in water or buried in damp soil). - Mummification: drying in a dry, ventilated setting; starts in thin, distal parts. - Both preserve the body's shape and injuries: they help identification and recognition of wounds. - Timings vary widely: generally weeks to months, with case reports of adipocere within a few days. - Bones alone cannot show whether death was one, five or ten years ago. ## What it is When the environment slows putrefaction, the body may be partly preserved. Adipocere (saponification) is the conversion of body fat into a soft, waxy, grey-white or yellowish substance through hydrolysis and hydrogenation of fats; it is favoured by moisture, little oxygen, moderate warmth and plenty of fatty tissue, as in submerged bodies or closed damp settings. Mummification is drying of the tissues in a dry environment with air movement; the skin becomes hard, like leather or parchment, starting with fingers, ears, hands and feet. Skeletonisation is the loss of all soft tissue, at a pace set by climate, fauna and burial. Several of these forms can coexist in the same body. ## How to tell it apart - Adipocere vs mummification: the first needs moisture and fat; the second, dryness and ventilation. - Recent vs old remains: laboratory methods (for example radiocarbon) help in specific settings but are imprecise in the forensic range. - Bone injuries: an injury made shortly before or shortly after death may look the same in a skeleton (perimortem injury). - The degree of drying correlates with time, but weakly: it does not allow a secure estimate in an individual case. ## How to recognise it - Adipocere: soft to hard, waxy, grey-white or yellowish material with a rancid smell, on cheeks, buttocks, abdomen, thighs and breasts. - Mummification: dry, dark, hard skin like leather or parchment, stuck to the bone; much reduced weight. - Skeletonisation: bones with remnants of ligaments, tendons or skin in the early phases. - Combinations: mummified parts next to areas of moist putrefaction or adipocere in the same body. ## How it forms - Adipocere: fats are hydrolysed into fatty acids that are hydrogenated; acidity and lack of water hold back putrefactive bacteria. - Mummification: dry air draws water from the tissues before bacteria destroy them. - Skeletonisation: putrefaction and fauna (insects, animals) remove the soft tissues. - Deep burial, cold and lack of oxygen slow all of these processes. ## Next step: what to do and document - Describe the type of preservation, its extent by region and the setting (water, soil, ventilation, clothing, wrappings). - Photograph and describe visible injuries in preserved tissue, which may be the only evidence of violence. - Request forensic anthropology and odontology support for skeletal remains, and preserve all bones and teeth with chain of custody. - Avoid precise time estimates: give wide ranges and explain their limits in the report. - Treat remains with respect and coordinate with the authority on release to the family after identification. ## Common mistakes - Assuming that adipocere or mummification always means many months or years. - Mistaking the shrinkage of mummified skin for wounds or tears. - Losing small bones or teeth during recovery of skeletal remains. - Giving a year of death from bones without other context. ## Test yourself Think of the answer, then tap the question to see it. ## What conditions favour adipocere formation? Moisture, little oxygen, moderate temperature and plenty of body fat; it is typical of submerged bodies or closed damp settings. ## What conditions favour mummification? A dry environment with air movement, which dries the tissues before putrefaction destroys them. ## Why does adipocere matter medico-legally? Because it preserves the body's shape, features and injuries, which helps identification and the recognition of wounds. ## Can examination of bones show whether someone died one or ten years ago? Not reliably: no method based on bones or teeth alone separates that range; context and special methods are needed. [Add to my cards (4)](https://durgical.app/estudiar/?add=/en/forensic-medicine/preservative-changes-adipocere-mummification-skeletonisation/) ## Connections ## Related 2 - [Decomposition: autolysis and putrefaction](https://durgical.com/en/forensic-medicine/decomposition-autolysis-and-putrefaction/) - [Estimating time since death](https://durgical.com/en/forensic-medicine/estimating-time-since-death/) ## Related conditions 1 - [Drowning](https://durgical.com/en/conditions/drowning/) [← All of forensic medicine](https://durgical.com/en/forensic-medicine/) Educational content on forensic and legal medicine; not legal advice and no substitute for the technical guides of Colombia's National Institute of Legal Medicine and Forensic Sciences. Laws change: each page links the official text and says when it was last checked. For a real case, follow the guide in force and ask the competent authority. Sources: [Forensic Significance of Adipocere Formation in Various Scenarios: A Case Series (Aravindan U et al.)](https://doi.org/10.7759/cureus.84283) (Cureus, 2025); [Mummification in a forensic context: an observational study of taphonomic changes and the post-mortem interval in an indoor setting (Ceciliason AS, Käll B, Sandler H)](https://doi.org/10.1007/s00414-023-02986-3) (International Journal of Legal Medicine, 2023); [Estimation of Late Postmortem Interval: Where Do We Stand? A Literature Review (Franceschetti L et al.)](https://doi.org/10.3390/biology12060783) (Biology (MDPI), 2023); [The Minnesota Protocol on the Investigation of Potentially Unlawful Death (2016)](https://www.ohchr.org/sites/default/files/Documents/Publications/MinnesotaProtocol.pdf) (Office of the United Nations High Commissioner for Human Rights, 2017). ## **Spotted a mistake?** We are always improving for the community. Tell us what is wrong and our team will review it. Report a mistake Representative model, for educational purposes only. --- Source: https://durgical.com/en/forensic-medicine/preservative-changes-adipocere-mummification-skeletonisation/ License: CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/). Cite as: DurgiPedia (durgical.com), https://durgical.com/en/forensic-medicine/preservative-changes-adipocere-mummification-skeletonisation/