The ‘blue’ for blue jeans was first made 6,200 years ago in Peru

Indigo dye may be older — and more American — than previously assumed. In a study published Wednesday in Science Advances, researchers report scraps of indigo-dyed fabric found in Peru that dated back to 6,200 years ago. That makes these blue jean ancestors nearly 2,000 years older than the previous oldest example of the dye, which was made in Egypt.

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