A 2024 Yunnan Daily report follows Huize artisan Kang Guiyou as he works with two apprentices on a piece of natural copper. The sequence is described in unusually concrete terms: removing impurities, hammering the metal into a plate, drawing the corners inward, forming a blank, then grinding and developing the spotted surface through further heating and treatment. The article attributes more than twenty steps to Kang’s account and says a pair of vases can take about six months. These details belong to the reported workshop and should not be treated as a universal timetable.
The work depends on feedback between the hammer and the fire. Kang explains that overheating can damage the metal’s internal composition, while insufficient heat can make the body crack during hammering. Between those risks, the maker repeatedly heats and strikes the material, using force and temperature as variables rather than following a simple fixed recipe. The surface pattern is not painted on after the object is complete; it emerges through the material process the report calls burning, boiling and revealing the spots.