Experimental Ancient Egyptian Human Mummification Tested in a Porcine Model: Excellent Preservation at a 13-Year Follow-Up

Aim of the study: Several previous experimental studies simulated ancient Egyptian mummification of human bodies using the embalming protocol described by Herodotus. Besides two human experiments, several animal studies have been performed with very different species, mostly over short observation periods. We used a human-sized piglet model that matches closely to humans and undertook a long-term experiment with two detailed examination time points over 13 years. This was conducted to test the efficacy of the Herodotus embalming method in the long term. Material and Methods: An 88 kg piglet, 1.30 m body length, obtained from a veterinary practice was chosen as the skin is similar to humans. Using the described formula, the carcass was cleaned, eviscerated, filled with spices and natron sachets, and then covered with 240 kg of natron for 40 days. It was then reopened, and most of the sachets were removed. The surface was cleaned with wine, the body cavity partly refilled with sachets and spices, the surface treated with oils, wax, honey and bitumen, and finally sealed with linen bandages. The body weight was regularly monitored over the 13-year period. At 7 and 13 years, re-examination, with a protocol including CT scanning, histology and microbiology, was performed. Results: The monitoring of the body weight showed a rapid loss of weight within the first year, gradually slowing, reaching more than 66% of its weight. In the final 6 years, the body weight was reduced by only 1.7 kg. The CT scans at 7 years and 13 years showed that the structures of the heart, muscle, skin, and soft tissue were well preserved, and the body significantly shrunken; only the musculature showed air inclusions. Histology and microbiology (examined at baseline, 7 years and 13 years) revealed excellently conserved tissue with anaerobic microbe spores, very limited tissue destruction, and no significant fungal or parasitic invasion. However, the preserved kidneys and internal genitalia had disappeared. Conclusions: This ongoing long-term project confirmed excellent mummification with near-perfect body conservation at 13 years, supporting the efficacy of the described Herodotus technique. This model is suitable for the assessment of special preservation techniques recently suggested for individual soft tissue organs.