This way of fueling salt production continued until the early 19th century when coal began to be used, and the scarceness of the forest resources caused by over forestation, which was carried out whilst ignoring the forest reproduction speed, sometimes provoked conflicts.
こうした製塩業向けの燃料供給は石炭が一般化する19世紀初頭まで続いたが、森林再生速度を超えた伐採の為に森林資源が逼迫し、争いになることもあった。