text: Haifuki-ho (灰吹法; literally "ash-blowing method"), also known as Lead-silver separation method (Korean: 연은분리법; Hanja: 鉛銀分離法) is a method of silver mining developed in Joseon dynasty of Korea in the 16th century and spread to China and Feudal Japan. The industrial process involved cupellation, and was a contributing factor to the large amount of silver traditionally exported by Japan.