Enlarge / Illustration of an embalming scene in an underground chamber. (credit: Nikola Nevenov)

Most of what we know about ancient Egyptian mummification techniques comes from a few ancient texts. In addition to a text called The Ritual of Embalming, Greek historian Herodotus mentions the use of natron to dehydrate the body in his Histories. But there are very few details about the specific spices, oils, resins, and other ingredients used. Fortunately, science is helping fill in the gaps. A team of researchers used molecular analysis to identify several basic ingredients used in mummification, according to a new paper published in the journal Nature.

Egyptian embalming is thought to have started in the Predynastic Period or even earlier, when people noticed that the arid heat of the sand tended to dry and preserve bodies buried in the desert. Eventually, the idea of preserving the body after death worked its way into Egyptian religious beliefs. When people began to bury the dead in rock tombs, away from the desiccating sand, they used chemicals like natron salt and plant-based resins for embalming.

The procedure typically began by laying the corpse on a table, removing the internal organs—except for the heart. Per Herodotus, “They first draw out part of the brain through the nostrils with an iron hook, and inject certain drugs into the rest” to liquefy the remaining brain matter.