Stripping bark from oak trees mixed with copperas (ferrous sulphate) it was used as a black textile dye. It was also used for tanning leather.

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Photo credit: © World History Archive / Alamy / Afripics
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Keywords: archival, archive, bark, copperas, ferrous, historical, history, mixed, oak, stripping, strippingbarkoaktreescopperasferrous, sulphateblacktextiledyetanningleather, trees