An unexpectedly preserved body when a tomb is opened requires careful examination. Preserved skin, flexible limbs, or internal organs are described and related to the time since death and the burial conditions. Recorded observations before later care or conservation measures are particularly informative.
Extraordinary preservation can be limited in time. Later decay does not negate the earlier finding; a layer of wax applied only after exhumation cannot have caused the preservation observed beforehand. The investigative process therefore first follows the chronological sequence and then examines possible causes.
Natural Preservation Must Be Investigated Specifically
Mummification results from extensive drying of tissues. Water loss inhibits processes that would otherwise contribute to decomposition. An examination of 102 forensic cases documented highly varied distributions of desiccation; appearance alone did not allow the time since death to be determined reliably. Dry outer skin therefore permits no blanket statement about the condition of the whole body.[1]
Adipocere, also called corpse wax, is a different alteration: body fat is converted into material consisting predominantly of saturated fatty acids. Moisture, oxygen availability, temperature, and soil chemistry influence this process. Controlled experiments on pig fat show that different burial conditions can promote or inhibit its formation. Animal experiments explain possible mechanisms; they do not replace examination of the particular human body.[3]
Long-term tissue preservation is also documented in forensic medicine. An original study examined skin and internal organs from human remains with adipocere exhumed after 21 years. Microscopically recognizable structures can therefore persist for a long time under certain conditions. This provides neither a natural explanation for every religiously venerated body nor proof of a miracle from duration alone.[4]
The First Exhumation Is a Finding in Its Own Right
A body may be unusually well preserved when the tomb is first opened and decay later. This does not undo a carefully documented first observation. Neither, however, does it retrospectively prove that observation's supernatural character. Experiments with human adipocere showed that exposure to air can considerably accelerate its further breakdown. Reburial changes the conditions under which preservation had previously existed.[5]
A traceable dossier must therefore record separately: death and burial, the first exhumation, later openings, and the condition after conservation interventions. A present-day photograph cannot replace the condition when the coffin was first opened. This is a methodological consequence of the material's changeability and of the documentation of successive examinations required by the Church.[2][5]
Findings and Examination Methods
The 2017 ecclesiastical instruction provides for a medical expert, such as a pathologist or forensic physician. Existing earlier documents are compared with the current findings. Body parts must be identified individually and their condition recorded in a signed report. If necessary, recognized conservation measures may be undertaken with the bishop's consent.[2]
Which additional examination is useful depends on the findings and the permissions granted. Computed tomography can examine the body's interior without cutting it open; its possibilities and limitations have been tested, for example, on thirteen naturally mummified bodies from Roccapelago. Histology, the microscopic examination of thin tissue sections, can identify preserved tissue structures. Chemical analyses can examine the fatty components characteristic of adipocere. None of these methods measures “holiness”; each answers a particular bodily or material question.[3][4][6]
The reconstruction includes the coffin, clothing, burial environment, and earlier treatments. A wax or silicone covering is not itself a preserved body part; neither does it automatically refute a previously documented finding of preservation. Methodologically, the original condition and later preparation must therefore be presented separately.[2][7]
Bodily Findings and the Church's Judgment
The statement of the Bishop of Kansas City–St. Joseph concerning Sister Wilhelmina Lancaster, dated 22 August 2024, provides a precise ecclesiastical formulation. It reports the medical examination, assessment of the coffin, witness statements, and soil analyses. Within the explicitly stated limits of the investigation, the preservation was assessed as very unusual for the burial conditions. At the same time, the bishop noted that the Church has no universally binding protocol of its own for establishing incorruption and that incorruption is not regarded as proof of holiness.[7]
Three results must be distinguished for every case: attested bodily preservation, an expert assessment of its extraordinary character, and an ecclesiastical miracle judgment actually issued. Canonization alone does not imply a specific judgment on supernatural bodily preservation.[8][7]
Sources and procedural documents
- [1] Mummification in a forensic context: an observational study of taphonomic changes and the post-mortem interval in an indoor setting
Original study of 102 forensic cases; different states of desiccation and decomposition.
Open source · doi.org ↗ - [2] Le reliquie nella Chiesa: autenticità e conservazione
Official instruction on the identification, anatomical documentation, and conservation of relics and mortal remains.
Open source · causesanti.va ↗ - [3] The effect of the burial environment on adipocere formation
Controlled original study on pig fat; publicly accessible abstract on burial conditions and chemical analyses.
Open source · pubmed.ncbi.nlm.nih.gov ↗ - [4] Histological observations on adipocere in human remains buried for 21 years at the Tomašica grave-site in Bosnia and Herzegovina
Original study of microscopic tissue preservation in human remains with adipocere.
Open source · pmc.ncbi.nlm.nih.gov ↗ - [5] Quantification of adipocere degradation with and without access to oxygen and to the living soil
Original experimental study on human adipocere; publicly accessible abstract on accelerated degradation with exposure to air.
Open source · pubmed.ncbi.nlm.nih.gov ↗ - [6] CT Scan of Thirteen Natural Mummies Dating Back to the XVI–XVIII Centuries: An Emerging Tool to Investigate Living Conditions and Diseases in History
Original study of the use and limitations of computed tomography on naturally mummified bodies.
Open source · doi.org ↗ - [7] Update regarding remains of Sister Wilhelmina Lancaster, OSB
Episcopal report with explicit limits of investigation; unusual preservation is not proof of holiness.
Open source · kcsjcatholic.org ↗ - [8] Divinus Perfectionis Magister
Apostolic constitution; separate medical and theological deliberations, followed by the Pope's decision.
Open source · vatican.va ↗