First, the brain was removed by passing an iron hook through the nose into the cranium and retracting it by the same pathway; the gray matter was discarded. Modern mummy excavations have shown that instead of an iron hook inserted through the nose as Herodotus claims, a rod was used to liquefy the brain via the cranium, which then drained out the nose by gravity. The embalmers then rinsed the skull with certain drugs that mostly cleared any residue of brain tissue and also had the effect of killing bacteria. Next, the embalmers made an incision along the flank with a sharp blade fashioned from an Ethiopian stone and removed the contents of the abdomen. Herodotus does not discuss the separate preservation of these organs and their placement either in special jars or back in the cavity, a process that was part of the most expensive embalming, according to archeological evidence.
The abdominal cavity was then rinsed with palm wine and an infusion of crushed, fragrant herbs and spices; the cavity was then filled with spices including myrrh, cassia, and, Herodotus notes, "every other sort of spice except frankincense," also to preserve the person.
The body was further dehydrated by placing it in natron, a naturally occurring salt, for seventy days. Herodotus insists that the body did not stay in the natron longer than seventy days. Any shorter time and the body is not completely dehydrated; any longer, and the body is too stiff to move into position for wrapping. The embalmers then wash the body again and wrapped it with linen bandages. The bandages were covered with a gum that modern research has shown is both waterproofing agent and an antimicrobial agent.
At this point, the body was given back to the family. These "perfect" mummies were then placed in wooden cases that were human-shaped. Richer people placed these wooden cases in stone sarcophagi that provided further protection. The family placed the sarcophagus in the tomb upright against the wall, according to Herodotus