Another reason is that there were some silver mines including Ikuno Silver Mine, Inaba Silver Mine, Tada Silver Mine and Tsushima Silver Mine as well as Iwami Ginzan Silver Mine in western Japan, and there was an abundant supply of cupellated silver produced by shiborigin (kind of silver) from rough bronze at Osaka Bronze Production.
また石見銀山を始めとして、生野銀山、因幡銀山、多田銀山、対馬銀山など多くの銀山が西日本に偏在し、また大坂銅吹所における荒銅からの絞銀（しぼりぎん）による灰吹銀の供給が潤沢であったこともその要因である。