This molecule, derived from the leaves of Isatis tinctoria L., a biennial plant in the Brassicaceae family native to the Caucasus and commonly known as woad, was found on ground stone tools. This is ...
An international research team coordinated by Ca’ Foscari University of Venice has identified the presence of indigotin - a blue dye compound - on stone pebbles dating back to the Upper Palaeolithic.
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