Tolong jelaskan mengenai Early modern steel dari Keluli dalam bahasa melayu

Blister steel, produced by the cementation process was first made in Italy in the early 17th century CE and soon after introduced to England.  It was probably produced by Sir Basil Brooke at Coalbrookdale during the 1610s.  The raw material for this was bars of wrought iron.  During the 17th century it was realised that the best steel came from oregrounds iron from a region of Sweden, north of Stockholm.   This was still the usual raw material in the 19th century, almost as long as the process was used.<ref>P. W. King, The Cartel in Oregrounds Iron: trading in the raw material for steel during the eighteenth century' Journal of Industrial Hisotry 6(1) (2003), 25-49.  </ref>