Potting and stamping is a modern name for one of the 18th-century processes for refining pig iron without the use of charcoal.
[1] The process was improved by John Wright and Joseph Jesson of West Bromwich, who also obtained a patent.
[2] The process involved the melting of pig iron in an oxidising atmosphere.
However, from c.1785, shortly before Wright & Jesson's process came out of patent, it seems to have been adopted by many ironmasters in the West Midlands.
Professor Charles Hyde argues that the potting and stamping process was largely responsible for a 70% rise in wrought iron production from 1750 to 1788.