It refers to the sake with high clarity, almost the same as today's seishu, brewed by the method using polished rice for both kojimai (rice for malt) and kakemai (rice for moromi [raw unrefined sake]) which is the base for present sake brewing, and it was called 'Morohaku' (sake of 100 percent polished white rice) compared to nigorizake (unfiltered sake) which was the mainstream sake at that time.
諸白とは、現在の酒造りの基礎にもなっている、麹米と掛け米の両方に精白米を用いる手法で造られた透明度の高い酒、今日でいう清酒とほぼ等しい酒のことを、当時の酒の主流をしめていた濁り酒（にごりざけ）に対して呼んだ名称である。