A vague musty aroma is not a simple by-product of the vicissitudes of ancient Egyptian mummies, but a "smell file" sealed in time and space. The latest research shows that this unique smell comes from a variety of chemicals emitted by mummies, which details how ancient Egypt continued to improve embalming formulas and burial techniques over more than two thousand years.
The study, led by a team of chemists at the University of Bristol in the UK, noted that the typical smell of a mummy is closely related to various substances used in the embalming process and the way the shroud was treated. The researchers stress that the systematic analysis of these odor components marks a key advance in understanding the history of ancient Egypt and mummification rituals, helping to reconstruct how this tradition became increasingly sophisticated over time.
Different from previous analysis methods that required solvent extraction of cultural relics and may damage the samples, this study adopted completely non-destructive technology and only sampled the air around the mummy's very small fragments, which are no larger than peppercorns. Researchers use solid-phase microextraction combined with gas chromatography and high-resolution mass spectrometry to capture, separate and identify volatile organic compounds in the air around the sample, thereby obtaining their "odor fingerprint" without directly destroying the remains.
Relevant results were published in the Journal of Archaeological Science. The team analyzed a total of 35 embalming paste and shroud samples from 19 mummies, spanning approximately from 3200 BC to 395 AD, covering more than 2,000 years of ancient Egypt's history. In total, the analysis detected 81 different volatile organic compounds, each providing time and recipe clues to the ingredients and processes used at the time.
The study further found that even at extremely low levels, these odor molecules can still be divided into four major categories, corresponding to different material sources: oils and fats generate a variety of aromatic compounds and short-chain fatty acids; beeswax releases monocarboxylic acids and cinnamic acids; plant resins contribute aromatic compounds and sesquiterpenes; and asphalt releases decalin compounds. Through these chemical "signatures", scientists were able to deduce the specific materials such as grease, beeswax, resin and asphalt involved in the anti-corrosion formula.
From a time perspective, the chemical profiles emitted by mummies have changed significantly in different historical stages. The volatile components of the earlier individuals were mainly relatively simple oils and fats; in the later stages, more complex mixing formulas appeared in the samples, including not only local materials, but also expensive imported resins and asphalt. The research team pointed out that the cost of these imported raw materials is higher and the processing is more professional, which reflects that with the development of the times, ancient Egyptian antisepsis has become more refined and professional in terms of formula selection and process control.
The researchers also noticed that the "odor composition" of different body parts is different, which means that embalmers may use differentiated formulas and processes for parts such as the head and torso. Taking head samples as an example, the combination patterns of volatile compounds are often different from those of the torso, which implies that the ancient Egyptians may have applied targeted treatments to different parts in terms of preservation effects, ritual significance, or status symbols. The research team stated that this phenomenon still needs further in-depth analysis to clarify the motivations and etiquette logic behind the differences in formulas.
Co-authors from the University of Bristol pointed out that the volatility analysis method used this time is extremely sensitive and can identify key markers at very low concentrations. For example, asphalt biomarkers that were previously difficult to detect using traditional soluble residue analysis can now be clearly captured using highly sensitive analysis of odor components. This technology expands the dimension of research on ancient Egyptian burial practices and provides a clearer and more complete picture for reconstructing embalming formulas, material selection and long-term preservation strategies.
This non-destructive method based on air sampling has significant practical value for museums and heritage collections. The researchers emphasized that odor analysis can be used as the first step in screening mummies. It can quickly obtain chemical information without touching or peeling off the shroud, or destroying the remains by taking samples, thereby helping curators evaluate the condition of the collection and determine whether further sampling and analysis are necessary. At the same time, traditional physical sampling still plays an irreplaceable role when in-depth research is required, but now it can complement volatile analysis to form a safer and more systematic research path.
The author of the paper said that by interpreting the "smell code" of the mummies, scientists not only restored the ancient Egyptians' technical choices for death and body preservation, but also gained a glimpse of their historical changes in religious beliefs, economic trade, and technological exchanges. These odor molecules, which have been sealed away for thousands of years, are now being rediscovered in scientific form, providing us with a new way into the ancient world without touching a single shroud.