Some questions such as what kind of liquor it was actually and whether it was similar to later kijoshu (special sweet sake) which was brewed several times is still not clear.
じっさいの酒質がどのようなものであったか、重複して醸すという点でのちの貴醸酒に通じるものがあるのか、などの疑問点がいまだ解明されていない。