MAMMALIAN hairs not only tell a story after death, they can keep doing it for millennia, withstanding extreme conditions, burial and mummification.
That's so intrigued forensic biologist Silvana Tridico it's lured her from crime scenes to a PhD candidacy with Murdoch University.
"DNA is fantastic but hairs tell you a story," she told AAP.
"So does DNA, but it will only give you the genetics of it, whereas you get the life history of the hair."
Ms Tridico and co-authors have a paper in the journal Proceedings of the Royal Society B that details the ways hair is digested and degraded after death in a bid to improve the reliability of findings in forensic, archeological and paleontological examinations.
"I wanted this to be a one-stop-shop that cites all the biodegradations you can get from mammalian hairs - from insects to bacterial to fungi because nothing like that exists," she said.
From a forensic perspective, the only certain indicators of death in hair are signs called post mortem banding.
"If you are going for a rescue, in a missing persons case, and you find that post mortem banding, you know 100 per cent that it is going to be a recovery," she said.
The paper says keratinolytic fungi has been found on the living even though it was previously associated with hair only after death.
Once that could have led to someone being wrongly suspected of moving a body after it had been buried.
It can still tell other stories though.
"Keratinolytic fungi can tell you this person died probably when it was very warm and moist, because fungi don't grow where there is no oxygen and where it is dead dry."
The researchers dismiss the myth that ancient peoples and animals were often red-haired.
They might have been, but it could also be the decaying process. (http://www.heraldsun.com.au/)
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