Indigo Dye: An Ancient History
A 6,000 year-old fabric from Peru is the earliest known example of staining textiles blue.
By Deborah Netburn. Saturday, September 17, 2016.
For the direct link, please go to:
http://www.latimes.com/science/sciencenow/la-sci-sn-oldest-indigo-dye-20160915-snap-story.html
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