498571 Pits in the Court of a Tannery (engraving) by English School, (19th century); Private Collection; (add.info.: The leather tanning process requires pits; soak pits to wash and soften the hides, lime pits to remove hair, bate tubs where the lime was neutralised and the skin plumped up ready for the tan pits where the skins were soaked in a tanning liquor. ); English, out of copyright.