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On a cold January day, he walked with her, retracing paths they had covered many times before: black earth, white patchy snow.

“We already know what black earth is, but we didn’t know how it worked,” he says.

Researchers dug through six layers of ash mixed with black earth to reach his skeleton, which was accompanied by two seals and other sacred offerings.

Dubbed the "Priest of Pacopampa," referring to the highland archaeological zone where the tomb was found, the priest was buried under six layers of ash mixed with black earth, with decorated ceramic bowls and seals indicating ancient ritual body paint used for people of elite standing, Peru's Culture Ministry said in a statement on Saturday.

"It's going to be hard to go back and see a black earth instead of a green earth," Ms August said.