However, it is said that a silver colored bare metal appeared immediately due to abrasion by circulation, and furthermore, Isshukin became as glossy as silver coins maybe because of solid diffusion when it suffered from a fire.
しかし、流通による磨耗からすぐに銀色の地金が姿を現し、さらに火災に遭うと固体拡散のためか銀貨同然の光沢となったという。