- Evidence Blue Indigo Was In Use A Staggering 34,000 Years Ago Ancient Origins
- Archaeologists Find Traces of Indigo Dye on 34,000-Year-Old Grinding Tools from Georgia Sci.News
- Traces of blue indigo on 34,000-year-old grinding tools suggest new Paleolithic plant use scenarios Phys.org
- Ancient Humans Used Indigo Plant 34,000 Years Ago: First Evidence of Non-Food Plant Processing Found in Georgia Arkeonews
- New Evidence Reveals Humans Were Using Blue Indigo Dye 34,000 Years Ago GreekReporter.com
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