Another theory says it came from what is called nanryogae that is the exchange of silver by cupellation with chogin at gin-za (an organization in charge of casting and appraising of silver during the Edo period).
また銀座で灰吹銀を引取り丁銀と交換した、いわゆる南鐐替（なんりょうがえ）が変化したものであるとする説もある。