Thursday 17 January 2019
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aaj.tv - 6 days ago

Rare blue stone found in medieval woman’s teeth

Web Desk: In nature, blue pigments are relatively rare, occurring in mineral seams that must be mined. Throughout the European medieval period (5th to 15th centuries AD), only a small number of natural and synthetic blue pigments were known, including ultramarine, azurite, Egyptian blue, smalt, and vivianite. The discovery of a rare, expensive blue pigment [ ]

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