File:Kano-dye-pits.jpg - Wikimedia Commons

A man works at a local fabric industry in Kano. Kofar Mata dyeing

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

NI-0240, Kofar Mata dye pits (for indigo), Old City, Kano, …

File:Kano dye cloth pit.jpg - Wikimedia Commons

Why Nigeria's historic dye pits in Kano risk closure

5 centuries in business: Nigeria's ancient dye pits

The Dying Dye Pits of Kofar Mata – Kamso Kids

Men present indigo clothes in the dye pits, Kano, Kano State

Kano – Travel guide at Wikivoyage