Archaeologists preserved the newly discovered remains using a variation of a technique developed by Italian archaeologist Giuseppe Fiorelli in 1863. The process involves pouring liquid chalk into cavities left by decomposing bodies; this plaster fills gaps in preserved bones and teeth, creating a cast of the bodies as they looked at the moment of death.

https://www.smithsonianmag.com/smart-news/remains-two-men-one-rich-and-one-enslaved-found-pompeii-180976383/