Artefacts hint at human sacrifice
Researchers in Mexico announced that they have found blood cells and fragments of muscle, tendon, skin and hair on 2,000-year-old stone knives, calling it the first conclusive evidence from a large number of stone implements pointing to their use in human sacrifice.
Mexico's National Institute of Anthropology and History said the finding clearly corroborates accounts from later cultures about the use of sharp obsidian knives in sacrificing humans.
Other physical evidence such as cut marks on the bones of ancient human skeletons had previously offered indirect proof of the practice.
Researchers in Mexico had noticed what they believed were fossilised blood stains on stone knives as long as 20 years ago. But the institute said it took a methodical examination using a scanning electron microscope to positively identify the human tissues on 31 knives from the Cantona site in the central Mexico state of Puebla.
The collection of stone knives is from the little-known Cantona culture, which flourished just after the mysterious city-state of Teotihuacan. Cantona preceded by more than 1,000 years the region's most famous human sacrifice practitioners, the Aztecs.
The archaeologists who found the knives gave them to researcher Luisa Mainou at the anthropology institute's restoration laboratories about two years ago. With help from specialists at Mexico's National Autonomous University, they were studied under the scanning electronic microscope and found to contain red blood cells, collagen, tendon and muscle fibre fragments.
While historical accounts from Aztec times, as well as drawings and paintings from earlier cultures, had long suggested that priests used knives and other instruments for non-life-threatening blood-letting rituals, the presence of the muscle and tendon traces indicates the cuts were deep and intended to sever portions of the victim's body. "These finds confirm that the knives were used for sacrifices," Ms Mainou said.
Susan Gillespie, associate professor of anthropology at the University of Florida who was not involved in the research project, said it was the first time to her knowledge that such tissue remains had been identified on obsidian knives. "This is a compelling demonstration that these knives were used to cut human flesh," Ms Gillespie said in an email.
She said other studies have found trace elements of organic remains such as food on ancient artefacts, so "with the right conditions such remains can preserve for long periods".
Ms Gillespie said human sacrifice practices either described by the Spanish conquerors or depicted in pre-Conquest paintings include heart removal, decapitation, dismemberment, disembowelling and skinning of victims.