For finishing, enhancement of the color was performed by applying agent such as salt, niter, chalcanthite, melanterite or kunroku (a sort of resin) to koban and warming koban over a flame to make gold color complete.
仕上げは、小判に食塩、硝石、胆礬、緑礬、薫陸などの薬剤を塗り火で焙って色揚げが行われ金色が整えられた。