The process of treating or tanning material with oak or other tree bark, or the state of something becoming bark-like.
From 'bark' (the tree covering, from Old Norse 'börkr') plus the gerund suffix '-ing'. Used in historical textile and leather-working contexts to describe traditional tanning methods.
Medieval tanners would soak leather in pits filled with oak bark for months—the tannins in the bark chemically transformed raw hide into waterproof, durable leather through a slow-release process.
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