JMN
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Real short version, the female mandible had traces of blue in her tartar. Yeah that stuff stays forever. They found out it was the blue pigment used to paint things making high end manuscripts. Very high end. The stone traveled from modern Afganistan to modern Germany and was then ground into a superfine powder.
Why a Medieval Woman Had Lapis Lazuli Hidden in Her Teeth
An analysis of dental plaque illuminates the forgotten history of female scribes.
www.theatlantic.com