Indigo, ash and time mark Nigeria's centuries-old dye pits

KANO, Nigeria (AP) — A little indigo, a handful of ash and time. The dye pits in Nigeria's ancient northern city of Kano are said to be the last ones of their kind after five centuries of existence.

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5 centuries in business: Nigeria's ancient dye pits

What is the history of indigo dye? - Quora