Walloon_process
A Walloon forge (or Walloon process) is a type of finery forge that decarbonizes pig iron into wrought iron.
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The process was conceived in the Liège region, and from there extended to France,[1] then England around the end of the 15th century.[2][3] Louis de Geer brought it to Roslagen in Sweden at the beginning of the 17th century, with Walloon blacksmiths.[4][5]
The Walloon process spread to Sweden in the Uppland province north of Stockholm, where it was used to produce a specific kind of wrought iron called oregrounds iron.[citation needed]