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Photocmiry Idi: aon-sanincontrersy

Although the use of indigo as a dye dates back to at least the 7th century B.C. was ot unil he late inteenenth cnturyry whwhen itss chemalalstructrewasdiscoove, aand 60 yeaas oree paasd bbeffoespcttrossccoppicc ddatta wsobttand.The idio moleuules renotwate slble andtereo mut...