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Early pre-Hispanic use of indigo blue in Peru

Archaeological research has identified the use of cultivated cotton ( Gossypium barbadense ) in the ancient Andes dating back to at least 7800 years ago.

Indigo Blue 1a LLLLLLLBecause of unusual circumstances of preservation, 6000-year-old cotton fabrics from the Preceramic site of Huaca Prieta on the north coast of Peru retained traces of a blue pigment that was analyzed and positively identified as an…

Source: Early pre-Hispanic use of indigo blue in Peru | Science Advances

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