This dentifrice composition is obtained by including water- sedimentable powder obtained by drilling holm oak carbonate (especially Bichotan, a kind of charcoal). 歯磨組成物中にうばめがしの炭化物をドリル処理して得た水沈降性の粉末を混入する。 - 特許庁
To provide a method for purifying muddy water such as water overflowed from a river and muddy water disposed over a riverbed or a seabed each containing hardly sedimentable particles as its suspended component, which method does not swirl up sediment settled if the flow rate of inflowing muddy water in a settling tank even is increased as in an event of torrential rain or the like. 豪雨などの場合のように沈降槽に流入する濁水の流入速度が速くなっても、先に沈降した沈降物を巻き上げることがない、河川越流水、河川堆積濁水および海洋堆積濁水のいずれかの難沈降性粒子を懸濁成分に含む濁水の浄化方法を提供することを目的としている。 - 特許庁