粗そ銅どうそどうじ字FuriganaMeanings1nounblack copper; crude copperTechnical term in metallurgy for copper that has been smelted but not yet refined; typically contains impurities.粗そ銅どうはさらに精せい錬れんされて純じゅん銅どうになる。Black copper is further refined into pure copper.
