Although it was a mainstream practice to use this bittern as a coagulant before the war (calcium sulfate (sumashiko) was used by some makers), it soon became difficult to obtain the bittern because it was designated as controlled goods. 戦前までは、このにがりを凝固剤に使用するのが主流であったが(一部では硫酸カルシウム(すましこ)も使われていた)、やがて統制品に指定されたため入手が困難となった。 |